I actually have a higher personal goal set for my FC, but a friend of mine wants to make 260whp with a streetport, S5 turbo, 720cc injectors/walbro 255lb/hr fuel pump, FMIC, 3" intake/exhaust, air/fuel computer, wideband 02, and a boost controller Is this doable? What would he need to do if not? Also, could he do it with stock injectors and fuel pump?

 

260whp is easily attainable with that stuff. Look into an RTEK 1.7 or 2.0 for fuel control, it should work pretty well for his application.

 

What you described is hardly a stock fuel system. If you are talking about at stock ECU, then its possible, but you would at least need a piggyback fuel computer like the Apex'i S-AFC II or similar. Something like an R-tek or even a megasquirt would be better.

 

That is exactly what I am running on my 89 tII, Apexi Super-AFCII, Greddy boost controller, walbro, 720 ccs...... yada yada..... Stock ECU.....it has been a while since i had it dyno'd but If i recall I'm pushing about 260 or 280. My recommendation: remove the smog pump and the dual cat's if you haven't already. (BYE BYE EMISSIONS) Also, remove the air conditioning pump and the power steering. Un-burden those Rpms baby!

 

im running nearly the same setup, s4 streetported, 3inch exhuast, 3inch tid, ill say stock injectors only due to the fact that i got fucked by another forum member(said they were 800cc but are not),ngk wide band o2, stock top mount, safc2, greddy profec bspec2(dont like), and thats about it, and im running 248hp and 237lbft of trq to the wheels at about 11lbs of boost and thats only up to 5600 rpms because it would lean out and start to ping. just make sure out of all those parts to buy brand new injectors dont trust anyone. so yes your friends goals a very realistic

 

oh and i have a denso fd fuel pump that will support up to 450hp

 

Wow, awesome. I'm glad to hear that this is totally doable. Now I just gotta figure out how to get 400whp reliably and usable for the track.

 

alcohol or water injection. Or so I hear. It'll show up on a search of these forums. Provides cooling to let you crank up the boost even higher.

 

you really, really don't want to do water injection.

alcohol all the way, water injection if not setup 100% properly will destroy your engine and everything else.

 

^^ So in other words, you really don't wanna do water injection unless you do it 100% right. lol

 

looks like we all have a similar setup lol

s4 streetported with s5turbo, racing beat turboback, greddy e-01 boost controller, warlboro 255, stock injectors and fuel controller for now (until i decide) .. I only cranked it to around 8 psi (refuse to go any higher ..) and I put down about 225whp

 

Im curious to know what year is your Turbo-II?
If its the 87-88 block than your facing the problem of cracking the plates once you start making anywhere from 375 RWHP and up. The problem is that they start to twist at a certain HP level and crack, unless you get the motored "Pin the Motor" also refered to as "Dowelling". I know this is for a fact my friend had a set up running high 11's on street tires and he would crack the rear plates often. From what I have read, and seen the best blocks are the S5 or S6 motors which take care of that problem. It's really all about tuning, and keeping it from running lean!
Also sorry to disappoint you, but even when you do it right your still going to break ****, thats the way it is. I mean its just the laws of physics. It also depends how you drive the car as well. If you dont believe me just try and see. I let me know how it went Good Luck. Realiability is an understatement.

 

I've got a '90 TII. The engine is going in for a full rebuild

 

Whatre you talking about water injection doesnt work and will destroy your engine?
You don't tune for water, you just use to to absorb heat. You tune for normal fuel AFAIK.

I dunno where that anti-water comment from. But I would look for second and third opinions before dismissing water. It has worked good for years and still does, same as alky injection. Don't dismiss it because of one persons post.

The thing is run some sort of auxiliry injection, water or alcohol, or a mix of both, but just run something.



Just slap a stage 2 BNR and a intercooler along w/ a decent standalone and your set. You can definately do it on stock ECU w/ piggybacks, but I'm not a big fan of that method.

 

Take a look at this. https://www.rx7club.com/super-afc-123/went-dyno-tune-afc-need-help-641671/ Your goals are easily attainable, even more so with an upgraded turbo. You just have to tune your motor properly. Although a standalone is the best way, the SAFC II is definitely worth the money.

 

you dont need any type of injection for that power level, that technically should be attainable on a stock turbo but, in reality probably best for an upgraded unit.

 

I think you're running alcohol injection into your liver right now, judging by your typos. J/K I agree.

 

So can he do it with stock injectors? I'm just looking for any excuse to steal the 720cc's he's got for my project, haha.

 

i see one typo, grammar ****!

Don't underdo the fuel, choose your engines safety/reliability over power first!!!

 

For 260whp, RELIABLY, you will need, at least:

3" exhaust and intake

720cc injectors in the secondaries. The stock injectors are basically beyond their limits at about 220-240whp, and aside from that, why risk fuel starvation? Injectors aren't that expensive.

Walboro.

Ported wastegate, and some sort of boost controller.

Some kind of fuel control. I can personally reccommend the Megasquirt, seen it used on 3 different cars now, nothing but awesome in all situations. Cheap, too. I don't reccommend SAFC or RTek.

Most importantly is a full tune up, including oil, coolant, plugs+wires, tranny+diff fluid, set timing, replace all vacuum lines, etc. The maintanence on these items and your tune will greatly affect the lifespan of the setup.

 

I was wondering the main reason why most rx7 owners do not run higher boost levels with the stock turbo? I have owned a few turbo cars and understand the intercooler being inefficient at certain points or the turbo. Is that the main case for the stock setup? If setup right, why is it not possible to run 14psi safely with proper fuel on the stock turbo and intercooler?

 

You can run 14psi on the stock turbo. However, there is no guarantee as to how long the turbo will live at this level. 14psi is about the limit on the stocker, most people run 12-13psi max.