Hey Guys, I am planning my next set of mods, and was wondering if anyone could offer me suggestions about the best way to go from here. Relevant mods include intake, AST, full exhaust with high flow cat, PFC, and some other stuff which is not important. I made about 275 with this set up.

So..obviously the thing to do next would be SMIC, and injectors and pump. But I don't really want to do this if it will only yield very minor power increases. I would rather just go to a single. I do not want to make massive power, but would like a good noticeable increase.

I do not and probably will not track the car at all, and driveability is important.

Ignore the cost aspect in the answer, the main thing with cost is that I do not want to do things twice, so I do not want the do some mods and get very little increase and then have to go back and waste money.

Any advice would be appreciated, especially if anyone has been in the same situation.


Adam.

 

Well, you will need to upgrade the intercooler, injectors, and pump anyway if you go the single route. You're not doing anything twice. You can make 340 on the stock twins without a doubt. I'll send you a PM.

 

goodfella thanks for the reply......everyone else thanks for nothing

 

How much boost were you running to get 340?Mods

 

Well considering you are basically at the same level of tuning as me minus a few things, I would tell you this is the following stuff for me.

-HKS Twin Power
-ACT Street/Strip Clutch
-ACT Flywheel
-Denso 280lph Fuel Pump
-1600cc secondaries, modified secondary fuel rail

All things you will be using once you go single and also I would add something like brakes, the stock calipers are pretty good. i would go with some slotted rotors and new pads, with stainless lines and some good fluid.

Ohhh, and tuning is always a good thing

Cheers,
Alex

 

Radiator and intercooler. Then injectors and pump.

 

Thanks Alex, from your experience will doing injectors and IC make much difference in terms of power?

 

I made 337 with all the bolts on's and 15 psi back in 2001.

 

This is a great thread - I bet a lot of us are in the same boat with our stage of tuning (minor leagues).

I have:

Cheap bastard intake mod
PFC
Exhaust, downpipe, high-flow cat
Upgrade fuel pump

Now I'd like to upgrade to the next step, which I guess is the intercooler. The only problem is that even with these basic mods I've been having a bit of a tough time keeping my car running right, even with a pro tuner (Seth Scally). Pipes kept on popping off, got that fixed and now I have spool up problems. I'm just not too excited about the amount of extra shop visits per year will be necessitated by an increase from 290hp to say 340hp.

Did anyone notice a lot more problems with the car with type of power increase?

How much does this next step upgrade run on average/ give me range if you will...

 

I would recommend taking care of all relability issues and then going for power. The stock radiator and I/C have plastic parts on them- they will fail- I would replace them first. Then replace all remaining vacuum lines and hoses- then go for power- Good luck-

 

Good advice.

Including these reliability mods, any estimate on a cost range anyone? I dont' care about bling or brand-name parts, just something solid and reliable.

 

For adamtassell, yes ofcourse injectors and IC will up your power big time.

An intercooler cools your intake charge, if you notice the difference from driving your car on a cool night vs. during a sunny day imagine that difference all the time. Also it allows you to run more boost safely.

Injectors deliver greater amounts of fuel to be burnt which means more power again.

Right now after Steves tune I am redlining at 91% injector duty, that means at redline my 850cc injectors are open for 91% of the time. So if you go to 1600cc injectors.... follow the logic?

However, I would not look at larger injectors until there is a need for them. The stock fuel setup can go to decent power levels. Steve said I was doing 310-320 rwhp from the patented butt dyno and let me tell you it is fast as hell compared to a stock FD and the stock FD was already faster than alot of stuff The car that RE Amemiya used to win the Best Motoring Touge Max class was ~340 rwhp! ( I know some people find that a useless reference) But it is to say that you can have a very fast FD with these kinds of power levels if the rest of the car is balanced, which is what I personally will be going for.

For qester007:

Why would you replace vacuum lines? What if they are good. I orded a Hosetechniques kit for my car with my other parts but I see no need to install it right now because my hoses are doing the job. Also someone with less experience (myself included) could easily turn a functioning sequential system into garbage by mis-installing these hoses!

For SammyD:

I was very lucky and bought a used old model Pettit Coolcharge II off a local member for >550$ US.

For the intercooler it depends on whether or not you want to buy another one later when you go single turbo.... If yes then go with a Medium sized one for now.

ASP Medium is 1,500$ new @ Rx7Store.net
and PF Mediums, Pettit Coolcharge II's, M2 Mediums can be found in the parts section for ~ 650$.

If you want a one time buy then go for a large sized SMIC such as the Pettit coolcharge III, PF Race, M2 large or ASP Large.

ASP Large 1,495$ from Rx7Store.net.

And the other can be found in the parts section for varying prices. Right now there is someone selling a PF Race sized and he is a very agreeable seller "aztectt" I had a PMwith him check it out!

https://www.rx7club.com/showthread.php?t=558411

For a radiator it is a more debatable subject.

The breakdown is:

Koyo, 100% larger than stock, ~330$
Fluidyne, 50% larger than stock ~ 450$
PWR, 50% larger than stock ~450$
MazdaComp/Ron Davis, prices and availability vary but a top notch rad.

I would personally go with the Fluidyne as it is not too big and the price is right.

That's pretty much it hope it helps.

Alex

 

That's a big help draydon03, thanks very much!

 

here is some advice... how about you sell the car and get out of the "mod bug" give a little money back to yourself... go buy a nice 50inch plasma screen tv... or a 4 runner truck.... I sold mine and it was the best decision i've made in my life!

 

Maybe not everyone derives pleasure from momentless slouching

 

well this is true... those were just examples of what the money could go to....

its a money pitt.... i bet most people put at least 5-10 thousand dollars a year in maintaining and modifying an rx7.... not much pleasure in that.... unless your philthy rich

 

Well #1 some people do have alot of money and instead of buying a 100,000$ car continue to modify the Rx-7 to a point which they are comfortable with. Also alot of people grow with the car so it is important to them.

Also like I was saying before balance is important for me. Yeah, it would ne nice to have the craziest FD of all time and stomp on Enzos, but at the end of the day and FD is an FD and an Enzo is well more than a car.

So having an FD that suits your budget and requirements is what is important. Maybe the fact that you didn't have your FD long enough didn't allow you to see it.

One night I was going over to pick up some pieces from a fellow members house. At the time my car was basically stock except wheels, tires and a CB. The other guy had his car a little juiced up, M2 Large, CF Intake, Custom Borla Exhaust, More importantly, AP Brake kit, Apexi N1 pro Suspension and Yok A048's. When we went around a hairpin curve and on the ensuing straight to his house my jaw dropped... No matter how I pushed he was going 10-15 kms faster around the curb and on the straight it was not even close. Thats when I was like I want balance like that!

Like anything if you want to go nuts with upgrades you can be spending crazy amounts of money, take a 250,000$ house and deck it out and you can easily spend 500,000$.

Alot of people are stock or as previously said in the minor leagues....

 

The stock I/C doesn't fail. Its problem is insufficient cooling, which is really only an issue when running higher power.

Dave

 

^

Becomes an inter-heater at higher power levels if I am not mistaken.:P

 

That's some great advice... for you. Glad you took it! Now since you no longer have the car, it time to let the RX7 thing go. You can do it man. Just *let go*. Good luck!

 

HAHA thats funny... sorry i just find it a little pointless to own a car that spends more time in the garage than in my driveway..... A corvette would be a better sports car... blown rotories suck

 

And your point in helping this thread is? Quit being a hater... You should had never bought one of these cars if you couldn't afford it.

you bought your FD 4 months ago:
https://www.rx7club.com/rotary-car-performance-77/im-new-can-someone-help-510508/
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/just-bought-93-rx7-take-look-pic-517555/

and it was an obvious piece of **** because 7 days later you blew the engine:
https://www.rx7club.com/canadian-forum-42/need-help-big-time-motor-done-who-cheap-fix-who-do-i-trust-519875/

either that or you got taken :P


Next time you buy a car do a little research on it will ya?

 

Current Mods-
PFC
Clutch
RB Duals
High Flow Cat
Downpipe
Intake
Fan Switch

I guess that puts me right in with you guys
My next move was a new IC, but I dont want anything on the exterior to show any sort of modding (RB Duals are only thing showing, and they arent to far from stock) so im going with a larger SMIC....and after that Im getting a tune and HOPEFULLY stopping