janrx7

I was wondering what would be the most whp on a street driven Rx7 that engine will last at least 10,000 miles? I know that is depends highly on tuning. I am asking for race gas or meth applications.

RIgtht now i have 429whp@15psi on sunoco race gas. Engine has about 10,000 kms and still feels strong. I want more whp but am afraid of losing my engine. I don't run my car @15psi all day (mainly 10psi). All my friend's fd who go after the high whp example 680whp, 590whp. Do only a couple passes on the track then boom!! gone!! I atribute this mostly to tuning.but i am aware that high hp rotaries are ticking time bombs.


i figure anything over 520whp, you better pray to ala.

Chaotic_FC

who knows, i'm aiming for 700rwhp on pump with water injection... but mostly running around at 450rwhp or so.. i'm hoping i can get 10k at a very minimum.. it will be my daily.

turbo10th

iTrader: (6)

Depends on the setup and tune. Mines safely tuned at 475rwhp@17psi(streetported) on pump and meth but it does spike 20psi and maintains a 11.1-11.2 AFR and has alot more room with race gas but feel no need to push it. Runs 10's(10.63 fastest) with full interior, a/c, p/s and stuff and drive it to and from the track and all the car meets. Was driving it everyday but gas was killing me. There are some guys out there that beat the crap out of there race car for years before a rebuild with like 700rwhp plus so hp is not *really* and issue. Meth injection would be a wise move to cut down carbon build up from street driving and redline it a few times a week.

janrx7

Like i said my last rebuild was 1 year ago (10,000kms) and engine is still strong. I would like more hp but have seen my friends rebuild their cars at least 3 times in the same time frame.(although their are with over 570whp and running 10.5s drag radials)

I am limited by my injectors (850ccX4), going to upgrade to 1600cc secondaries. Aim will be 520whp@20-23psi . SInce my turbo is a bit small (0.81 hotside). Hope engine gives me at least 5,000 miles before next rebuild.

WaachBack

iTrader: (21)

Yes, it all depends on the tuning and type of fuel or A/I, but takin everything into consideration, I'd say that 500whp is the crossover point. Why would you need more then that anyway? That is enough ro run mid 10's in an FD.

darkphantom

iTrader: (2)

talk to turbor1. hes got over 10k with 1000miles of dyno & track time on a stock ported motor with 30psi


let me say that if the tuning is right & the motor is built ford tough then i wouldnt see any problem why it wouldnt. But just to know anything cheap on the car will hurt your reliability. And make sure to cure any problem that comes up on the carasap


edit: just to add something

A rx7 with 600hp @ 30lbs will break way before a rx7 with 600hp @ 20lbs will

janrx7

So taking this in account what would be the crossover point breaking point in terms of PSi? 25psi? 30psi?

My engine has been dowel.

Chaotic_FC

that would depend on how cool you keep your engine running.

you need to reaaaallyy take the heat out of a rotary to get some reliability.

janrx7

I have a v-mount intercooler for this purpose. Need get upgrade the radiator and vented hood. Still i have never had heating issues with my car.

WaachBack

iTrader: (21)

This is too broad of a question to answer...but as previously stated, if you can make more power at a lesser psi and cooler EGT's that's better.

I personally would keep it under 25psi on a true street car if you want some life out of your engine, even with race gas or A/I. I run 23psi max.

darkphantom

iTrader: (2)

i had 500hp and daily drove my car on pump gas everwhere. Besides it was my only car back then so i had no choice. the only thing i regret was that things broke on the car since its over 10 years old (but wasent the motor)

within those 3 years i had the drivers window switch, the 5th gear, clutch pedal (drove home in 1 gear), and the map went rich on its own so if the car didnt start by the 3rd time it would flood the plugs.

rx72c

iTrader: (8)

im at 35psi.

so far covered around 1250kms. Obviously a small percentage is at full power but it does get a flogging.

im at 700rwhp.
I dont see why it wont cover alot more then 10 000kms. As long as i dont play with it, no reason why it wont be reliable. Well see how it goes as i am done fiddling with it.

Im playing with an rx3 now with the same setup with a more agressive porting setup. see how that goes. ill put pics when its running. should be a week or two.

synergy7

iTrader: (20)

You cannot cut corners when it comes to making power and there will be tradeoffs (Generally Speaking).

Power vs. Reliability
Power vs. real world Drivability
Power vs. Comfort
Power vs. your Bankroll
Power vs. Safety (for super the cheap guys)

Agreed one of the main factors is tuning. You have to ask yourself 1st “what is your goal”, there will always be more (higher hp numbers)...

Do you want a:
Street car?
Dyno queen?
Drag car?
Reliable fun to drive car?
SPECIFICALY what are you looking for?

Sounds to me like your main concern is reliability, and if I am correct then don’t push it be happy that your car staying on the road while your friend KEEP blowing up.

429hp is a lot of power don’t believe everything you hear or read most manufactures are printing higher numbers for the 2 ton+ (4000lbs) cars they are producing (but that’s a whole other subject entirely).


If you want your car to respond faster maximize your 429hp look into lighter parts. A lighter flywheel & lighter rims can make a huge difference.

janrx7

I think the answer to this question is going to cost me 500$ (new side seals and gasket set) in case something breaks. Like I
Said aim is 520whp@23psi. Going to get new injectors and retune. Hope it holds. Worst case scenario, it breaks, rebuild and detune to 450-470whp. Keep u posted with results.
Already have act lightend flywheel and volk rays te37 wheels.

andre sinclair

iTrader: (36)

400 hp is all you need + a good driver

catch-22

iTrader: (2)

^couldnt have said it better.

Viper GTSR

Yeah, if you're tryin' to get WALKED like a 'hoe' by almost any run-of-the-mill supra on the street...lol!


...500+RWHP for the kill*


Cheers,

~ Kayvon

synergy7

iTrader: (20)

The question is how much to be reliable not how much to beat a supra or anything else. I guarantee that no matter how fast you are there will always be someone faster.

If you want to talk about being the fasted (or high hp numbers) that’s completely different subject.

arghx

iTrader: (3)

the problem that you start running into with real high horsepower on the street is that it's not that usable. It's a lot easier to put the car into a ditch or get arrested with that kind of power. I'm right at that level right now I think, 16psi on straight pump gas (T04R turbo). Just the other day I was visiting my parents, and on the way back I floored it in 3rd down this 40mph road near them. I look down a couple seconds later and i'm at 80 and still pulling... I had to remind myself just how dangerous and risky that is.

synergy7

iTrader: (20)

Edit

I see your point and agree he will be outmatched in some respects, But...

429hp is a good hp number we have just become numb with all the grandiose claims being thrown around.

I live in S. Florida, you dont have to worry about Supras, you have to worry about ANYTHING that can fit a 1jzgte (2jzgte) in it. Guys down here start talking @ 700hp+ , But that does not make 400+ any less of an accomplishment more so when it can be driven problem free.

andre sinclair

iTrader: (36)

I live in S. Florida as well. And, like I said 400 is all you need. It all depend on what an individual has built the motor for Ex: either to run the boost or Rpm.

With my 3rd Gen 402 hp, I love running the rpm, 9000, on occasion 9200. However, my 2J, 1st Gen 481 hp, I shift at 7200. Both motors run 19 psi. Personally, I feel the 2JZ is overrated and rotary is the best bang for the buck... as far as horse power goes.

Furthermore, once you have a 2 car length lead from an online pull there’s not need to play catch - up.

janrx7

Here in Dom Rep, there are no real speed limits (at least not enforce) so i don't worry about speeding. Heck, two weeks ago i was on my friend's 801whp Skyline GTR R33, on the street checking how much boost doesn't it make in third (35psi). hahaha

When i had 290whp, i want 300, then 400 and now i want 500whp. I plan to run nitto 555r drag radials on the street, and a ocasional visit to the drag strip. Reliability is the key. I don't want 600 not even high 500s, just break over the 500 mark, run low 11s or maybe high 10s, thats enough for me i hope.

zinx

iTrader: (3)

Not a chance. 600 wouldn't even be enough around here.

Viper GTSR

Agreed, 500rwhp will just ''put you on the map'' as far as the street big dogs are concerned...maybe not the fastest thing around, but you will get respect from just about anyone, anywhere. At 400rwhp you're playing in the ''little league's'' bro lol...


There's absolutely NO reason that with the modern stand-alone, knock sensors, and AI kits you can't build a reliable 500+rwhp daily driver. (as we've already seen many times over)


Cheers,


~ Kayvon

RacerXtreme7

iTrader: (2)

If you cannot break low 11's with 429hp at the wheels, you don't need more power, you need to practice your driving!