dbragg

iTrader: (7)

do you have any pics or specs on your rearend modifications?

KKMpunkrock2011

iTrader: (5)

amazing build, I'm jealous. a guy here in town has a 1jz FC that just ran an 10.9 on the strip, thing is a beast, love they way it feels around town on lower boost, amazing torque.

For reference, what were some of the times the other cars were posting? the GT-R? The porsche? the two subies?

Howi

iTrader: (2)

Thank you.
I'm using Tein S-tech springs, and the height seems just about right for street and track.

It's a stock rear end. I only modified it so that the rear diff is now mounted independently (obviously I'm not using the PPF).


I'm running stock boost. Just turbo boost straight to wastegate, no boost controller. I think the motor should put down about 280hp whp if I didn't have ignition break ups.

Thank you! Yes the power curve is quite different from a turbo rotary. The power is more linear and makes the car easier to drive on a circuit track.

To give you an idea, this is some lap times posted by Onyx Syndicate (their top 10):
My RX-7 - 1:22.0
Porsche GT3 - 1:20.0
Dodge Neon ACR - 1:19.4
Audi S4 - 1:18.0
Porsche Boxter - 1:17.8
Mini S - 1:17.7
BMW M3 - 1:17.3
BMW M5 - 1:16.8
Nissan 240sx - 1:14.7
Honda Civic - 1:14.2
Audi R8 - 1:13.7
Nissan 350z - 1:13.6
Nissan 350z - 1:13.0

As you can see, I need some stickes.

Howi

KKMpunkrock2011

iTrader: (5)

were those other cars running r comp tires? as you stated I would've thought you'd be in the range of the m3 at least, unless some of those others (as i'm assuming all except the R8 are) are modified

Howi

iTrader: (2)

These are all cars that attend lapping events. I'm not sure if you've been to lapping days, but they're free for all in terms of mods. There are no restrictions for modding your cars.

I've only seen a few of the cars I posted in person (not all the cars listed were present at the event I attended), so I can't tell you what they've done to their cars.

However, I can tell you that from what I've seen at Dunnville, it's pretty hard to break 1min 20sec without running on decent tires. You'll start breaking 1min 20sec running on really stickie street tires. Regardless of what car you have, it's ultimately your 4 tires that will give you your lap times.

I know it's tempting to compare lap times by looking at car models, afterall, there are huge cost differences associated with some of these cars. But there are simply too many variables invovled. I can tell you for sure that a stock Porsche GT3 is definitely not a car that's 6 seconds slower than a stock Honda Civic on Dunnville.

R-comps will typically get you 1min 16sec or better. This is the territory where your power, braking, and suspension mods will start to make a big difference.

Can't wait till next year.

Howi

thewird

iTrader: (8)

If I remember correctly my time on street tires was 1:18 but I think I had more power then you at the time. I was still learning at this time too. Later in the season I went back for some tuning on street tires since I didn't want to bring my track tires I was able to do a 1:14 (difficult though). However, I have many upgrades to brakes, suspension, street tires are a little bigger too, and again power.

thewird

KKMpunkrock2011

iTrader: (5)

I was just wondering since, as you stated a stock GT3 isn't 6 seconds slower than a stock honda civic, if you knew what was done, being from nebraska we have very few opportunities for track racing nearby and i was unsure of the rules at your particular track or if there was perhaps a classification system

nevertheless, awesome build, and good luck next season, can't wait to see the results!

Howi

iTrader: (2)

You're a fast kid. I've seen your dunnville videos and you're as smooth as butter. So smooth that I thought you were dead slow, until I timed the laps to be around 1:14.

I've only tracked this car twice, and been on dunnville 3 times. I still got lots to learn.

Btw, what street tires and sizes were you running? I think 1:14 is incredible on street tires regardless of your mods!

The GT3 was there when I went. It was red, nearly new, totally stock. The driver was probably learning, taking things easy. On the other hand, the civic is a regular, although it's nothing out of this world in terms of mods. Just the regular EK Civic hatch with the standard B16 engine, coilovers, RA1s... etc. It's just an overall connected and well put together car, plus a good driver of course. This guy is a personal friend of mine.

The only other thing I can tell you about the other cars is that the Boxter is driver by a girl running Hoosiers, and the Mini is driver by an older gentleman with slicks also. Both of them are regulars.

Thanks for the compliments buddy.

Howi

thewird

iTrader: (8)

They're Jim's old wheels, 18" rim, 245 front, 265 rear. The tires are BFG something (i think lol). I remember the threadwear was 340, thats about it. The biggest difference I noticed with street tires was lack of braking, I had to brake a lot sooner and the tires would lock up easier (I don't have ABS).

thewird

twofourzerosx

clean build, cool swap. i wish i got to paint my car in a booth

Howi

iTrader: (2)

Seriously?! You hit 1'14" with treadwear 340 tires?! Even though you're running much wider tires than me, it's hard for me to believe.... Unless my/your timer is off or something, it's hard for me to believe that you're almost 8 seconds faster than me considering I already have no traction at my power level. My tires screech constantly even when accelerating in a straight, so I can only imagine that more power will only make it worse....

Regardless. You and Jimmy are the bar and I'll try my best to keep up next year. I'm getting the lap timer from Aimsport (Mychron Light GT) with 4 other buddies of mine, where we'll share split and lap time beacons. I'll see if I can go near your time with 245 r-comps.

Lol.... I'll give myself at least another year before I try to go near Jimmy. It's ok that jimmy is faster than me because he must have at least another 40 years of driving under his belt HAHA!!

Thanks dude. It's the first paint booth experience for me too. I went the cheap *** route: just paint the hood. My buddy used the closest paint chip and just sprayed it without blending into the rest of the car (I didn't want to pay for it lol....), so it's about an 80% colour match. Lol.. you can definitely see the difference in colour if you go up close. Can't complain considering it came to $600 for all the custom work and paint.

Howi

thewird

iTrader: (8)

I just had a very accelerated learning curve thanks to Jim training 101 (he was grabbing my steering wheel forcing me into the line lol). Also, I kept upgrading things on my car that I felt were needed (some of the stuff were things Jimmy told me to do beforehand but I didn't listen). It also helped that I was at the track almost every weekend this year lol.

My fastest time on 245 Hoosier R6 r-comps was 1:11.9x clocked by GPS. I was only able to do it a handful of times and the tires had to be kinda fresh.

I'm hoping with my new Dave special ported motor and single turbo, coil-overs (still undecided), and 285 Hoosier R6's like Jim's I could break 10's, maybe 9's (i wish)?

thewird

7_rocket

iTrader: (6)

Do you ever listen?

JDK

iTrader: (8)

lol....There's going to be lots of dust flying next summer, for the record Marco's lap times are pretty much the same as mine and should be much faster then mine next year with the extra 100 whp he will have, at Dunnville and Cayuga that is...We'll see what happens at Mosport

thewird

iTrader: (8)

I'm a Mosport noob :'(, got 4 laps into it before the motor popped this year. Our power isn't that much different lol, its more like 20-40 (im not going to be running 18 psi at the track, probably 17). Plus, your car is lighter, stiffer, and Jim is behind the wheel :P.

thewird

paul_3rdgen

iTrader: (6)

Howi, where did you get your rear diff support idea from??

https://www.rx7club.com/showthread.p...hlight=fd+diff

I don't mind people copying my setup but just admit to it.

Howi

iTrader: (2)

LOL... wo wo wo... what's with the attitude buddy? Please don't make it sound like I tried to deny this in the past or something... You know, I've never once claimed that it was my design.

I've done my research (but never knew that paul_3rdgen=Paul Imbrogno) and looked at all existing designs, yes, including yours. In my opinion, I believe that your design is the most efficient and strongest.

The only thing is, your design is grossly oversized for my power level and application. I don't have 500hp and I don't drag race. I took your concept and optimized it for my application, and built it with the material that's available to me.

Thank you Paul for your beautiful design and trusses. You saved me a ton of time from fabricating and test fitting various other designs. I did modify some details to my own preference to make it a little stronger, a little lighter. But I will give credits to where it's due and will never attempt to deny the fact that I benefitted from your concept.

Don't worry Paul. This is my car, and I built it with my own hands. I'm not selling any part of it as a "1JZ kit".

Thanks again Paul.

Cheers,

Howi

paul_3rdgen

iTrader: (6)

No problem, sorry for the attitude. I eneded up changing the design as well when I was building them for a group buy I had, the chromoly bars stayed the same but the mounting parts where different. The pic in that thread was the first, here's a pic of the new mounting.

thewird

iTrader: (8)

I just want to make a correction on my posted lap times... I got my lap timer from my car today and put some new batteries cause I wanted to look through it. I then realized the time I thought I did was incorrect. My fastest lap times at Dunnville were 1:12.9 ... oops, must have have did 1:11.9 in a dreams or something . Jim might be in the 11's though. However, the time on street tires is still correct.

thewird

chrisdrx

i wow'ed by the whole convo ill be looking to do the swop over to a 1jz engine my self this year any tips or words of advice

ahad

@howi: first of all i just wanna say dude! nice setup uve got there...very nicely done...ive swapped a 1jz-gte in my fd too...mines alright i lowered the steering rack to get my stock hood to work (regretting it big time cuz o the bump steer!) anyway i just wanted to know what the condition of your motor is cuz i dynoed my car at around 8psi and i got 198whp. I was pretty shocked to hear that figure cuz my motor seems fine and my turbos arent smoking either...i see you got around 240whp at 10psi so thought id ask you.thanks!

@chrisdrx: Advice: DO NOT lower the steering rack for the stock hood!

Howi

iTrader: (2)

Hey sorry big guy! I just realized that I've never responded to your post. That's a killer design and fabrication; sure beats my hocky pucks! Did you make this for yourself or are you thinking of selling it as a kit? If you're selling it, I may be interested!

Hello! Glad to meet another owner of an 1JZ FD. Thanks for the compliments! To make you feel better, I also lowered the steering rack and kept my stock hood in my first attempt. I only drove it down the street a few times, and with only 1 month after the completion, I bit the bullet and ripped it all apart, re-did the entire swap. The bumpsteer was unacceptable and beyond correctable. If you're just cruising down the streets, as a daily driver, I guess it wouldn't matter. I built my car for 70% track and 30% street so it's obviously not an option for me.

I had severe ignition break ups during my dyno tune. It was so bad I had to resort to gapping the plugs at .020" to continue the tune. If I didn't have ignition problems, I believe 260~280whp should be expected on a stock 1JZ with free flowing intake and exhaust, and a boost controller. I'm certain that there are some problems with your setup. Check the injector duty cycle and see whether they're maxed out, check for ignition break ups, check whether the cam timing was set correctly, check your ignition timing.. etc. I can guarantee you that a stock 1JZ is much more capable than that.

Why are you running 8psi anyways? I don't have a boost controller hooked up at all and the wastegate naturally regulates the boost at 10psi. I can't even run 8psi even if I wanted to. Maybe the problem is related to this....

Howi

paul_3rdgen

iTrader: (6)

Howi, I made it as a kit for the V8 FD guys. I made 10 of them about 2 years ago and nothing since but I still have the 2 sets of mounting plates and I can tell you where to get the poly diff bushings if you want them. let me know.

Howi

iTrader: (2)

A quick update for 2009. We participated in Onyx Syndicate's track day at Dunnville Autodrome on Saturday May 23:


We had 2 objectives this track day:

1. To test our new AimSport MyChron Light TG lap timer system.
2. To break in our new BFG R1 slicks, 245/45/16 (thanks to Jimmy and Al).

We broke in our slicks, then took them off and ran on our old street tires for the remainder of the day. These are the same BFG G-force sport tires we ran last year, stock size @ 225/50/16.

We achieved a time of 1 min 18.7 sec with these tires on Saturday. Not bad for crappy 225 street tires.

The new slicks will be fully cured by our next track day. We expect to shave off at least 2 full seconds with them. Hopefully, we'll break in the 1 min 15's or better.

We met a fellow RX-7 enthusiast, I believe his name was Todd. He had a black FC with a V8 swap, and was lapping with us for while but something went wrong with his electrical system so he had to retire early. I didn't have much time to help him except lending him my tools. I hope he made it home safe and sound that night.


Hey Paul,

That's awesome. I'd love to see your design in person and perhaps pick up a set from you. Please check your PM.

Howi

thewird

iTrader: (8)

Nice, your getting there . Looking forward to results with the slicks.

thewird