tcb100

I ran an 11.80 @118.54 tonight.

That's with a high flow CAT, not a midpipe, on a car that passes Maryland emissions dyno-testing.

I am running the good old PFS Purple computer, the PMS, and the PFS medium, stock mount intercooler, the red one. The pieces work and work well.

Mostly however, Peter put my car on the dyno and tuned hell out of it. It's been said over and over, but the short story really is "it's all in the tuning".

You don't necessarily need the newest pieces to make the car reasonably fast, you need a really good tuner.

88IntegraLS

I agree!

j9fd3s

iTrader: (3)

you need a good combonation of parts too

mike

BenzaLee

What kind of rubber were you using?

tcb100

Mickey Thompson ET Streets

pp13bnos

iTrader: (1)

I've never heard of somone saying that peter could'nt tune at all. But my question is, what type of a/f ratio are you running? CJ

Tim Benton

iTrader: (1)

he can't tell....Peter swears everyone to a vow of silence Or atleast that was the case before.

What was the rwhp IN SAE form, not std since it adds about 6 to the number. Also at what boost?
Tim

tcb100

Tim & PP13, I don't really know the definitive answer to either question.

Ballpark HP, I think he said 330 to the rear wheels the day it was dynoed (90 degrees & humid as hell) but I would guess probably +15 Friday night with a really cool, dry evening for a change.

I have no idea if that was standard or SAE. Matter of fact, I did not even ask what it made. I asked him to get the most out of it that he could & we left it at that. The dyno number is interesting I suppose but the question is what does it turn? I bettered my best time by .26 and my best speed by 4.5 MPH. I'm making a lot of power for stock sequential twins and a cat to turn 118.5, I know that.

As far as boost goes, I asked him to set me up for the maximum boost my tired turbos will make. The night I ran I was making 16-17 libs, at least for a lot of 4th. It's hard to pay attention to the boost guage during the race & until I hit 4th I did not look at the gauge.

rynberg

You are running over 15 psi with the stock fuel system and stock 2-bar map sensor? And since you told Peter to go all out, probably a 12:1+ a/f ratio under high boost, with advanced timing?

You are driving a time bomb..and the timer's getting short.

tcb100

Rynberg, I really don't think its a time bomb but we will see, because I think I can get the times down a bit more. I asked him to give me the best he could but he is not going to set me up to self destruct. I am a regular customer and have been since 1995.

I use the PMS & the car spends it's life on the second map at around 12-13 lbs of boost, except for a few runs a week at max and then only on 104-107 unleaded race fuel, depending on what the track sells.

My water temps never got over 195, no pinging, and no spikes. According to my datalogging, the injectors do seem to max out from time to time but they have been doing that for a year anyway & Peter did not suggest an upgraded fuel system or boost sensor. My wallett was open so I have to go with his judgment.

In short, my impression is that people running sequential twins and using a midpipe are driving a time bomb. Keeping the cat keeps spikes under control. I can only hope you are wrong.

rynberg

I hope I'm wrong about the A/F ratio tuning too but I think many people on here would agree with me that running 15+ psi on the stock fuel system and map sensor is not a good idea and is leaving absolutely no margin for error.

BTW, that's an awesome trap speed and ET..

tcb100

Yeah to be less than modest, it is an awsome trap speed and ET but the credit goes to the tuner. My role was a mediocre 1.7 60 foot and 3 shifts I didn't screw up. Conditions were perfect too. A cool and dry evening.

I'll probably run a 16 next time.

dubulup

Peter does know what he is talking about, and I have a similar set-up as you.

Nice numbers.

SPOautos

Id imagine the cat is the reason you can run 15-16psi without being severly lean. 16psi with a mp is going to be more airflow than 16psi with the cats. Your probably running about the same airflow as a mp car at 14.5ish psi of boost

tmiked

Tom, are you running the stock fuel pump?
What fuel pressure ?

Mike

tcb100

Mike, I still have the stock fuel system. Whatever stock fuel pressures are, I got em. As I said above Peter did not suggest an upgraded fuel system & I was willing to pay for whatever he recommended. Given my mods, he thinks the stock injectors and pump can handle it.

I am about at my limit with the car however. My driving, especially my 60 foot, needs some improvement but the way I see it, nothing except going single is going to matter enough to justify the cost.

tmiked

Tom,
The reason I asked, as you know, I am planning to run a similar setup to yours except stock porting and a FMIC.

I bought a RP fuel Pump and a Aeromotive FPR. I was planning on upping my fuel pressure 10% - 15% or so. The plan is to not have to push the duty cycle of the stock injectors too high and then lean out the cruise settings back to around stock.

Mr rx-7 tt

iTrader: (5)

Peter knows exactly how to tune and what he is doing, I wouldn't worry.
I wish he would have been more open to tuning a couple years back as he could have sold and made a ton of money from a bunch of us down the road. (7 cars). One of us a bought a computer from him and we tried to get him to dyno but there was always an excuse. We decide if we couldn't get support that we would just buy used computers as well and we all did back then...we all bought other aftermarket equipment as well for the same reason...oh well.