Dark_Teg

Long story short...My car is almost done, I called my tuner. He says "the dyno is down for at least a month but we can street tune no problem." I asked him if it would be safe to street tune a 500whp CRX and he said "we just street tuned an 800whp Z06." How common is it to street tune a car that will likely make 23 psi or so and make 500+?

TheShodan

iTrader: (14)

Very common... He may not get all the hp out of it you'd want, but many quality tuners do both; street tune the partial throttle and some higher rpm situations, then go to the dyno to finish it off.

Hell, my tuner's street tunes are better than a lot of people's dyno tunes..

ls joker

how safe is it tune a 500whp crx at 23psi in fourth gear would be my concern. unless hes tuning low cam only.

Dark_Teg

That's my concern 140mph in a CRX is sketchy. I have 3 dyno's near my house but no tuner.

I guess Ill give it a shot. I can always dyno it locally if I want a number.

ls joker

if it was me, id just get a part throttle/cruise tune

1158

My tuner does part throttle on the street. I agree with you 4th is gonna be interesting. I know 4th gear pulls in my car is scary and I wouldn't want to do it over and over again as would be needed for tuning. Do you know where you'll be doing it? What roads? I know some people who have access to a private runway. Something like that would be ideal for this.

Let me clarify here. The reason I feel 4th gear is scary has to do with road conditions. That's why I asked if you knew the roads. My suspension and bushings are all brand new but the roads around here are not good.

LightningTeg

I've always done my tuning on the street, from 200whp to 600whp. It happens so quick it doesnt matter, as long as you hook, and your suspension and brakes can handle it.

TheShodan

iTrader: (14)

That's exactly like my tuner's environment

OneBadTurboCRV

That has to be one of the worst comparisons I have seen. They aren't even close... in the domestic world they want super long datalogs and the ECU makes TONS of auto corrections. You don't have that on an OBD-1 tuning platform. Either find a new tuner or rent a dyno and bring your tuner with. I don't feel like getting into the whole WOT 4th gear pulls on the street crap again...

h2.4

How do you find MBT on the street? Or rewrite a 3d timing curve on the street? I'm sure you could make it "work" but......... to each his own.

wunfstgsr

Just get a base map and wait till the dyno is ready if your scared of a street tune.

LightningTeg

Listen for detonation and reading plugs. Wont be able to get it as close as a dyno, but close.

Nottheonion

Thats good for wot what about before that?

h2.4

Yes, I know that. I tune cars at our shop. Try tuning a car by listening for det. With the exhausts everybody runs and turbo applications. Crap shoot at best. Reading plugs will get you in the ballpark. But all of the cars I've tuned on the dyno, I have reached MBT without ever seeing det on the plugs, fuel not limiting. Then also, It's gonna be hard to tune the ignition "curve" for that particular combination, it's a different curve every time. If you were to do it yourself on your own time street tuning, you could get it alot "closer" than paying a shop to spend that much time to street tune. There will be a time when It will be hard on the trans to tune on a dyne, but this power level the OP is looking is achievable on a dyne if done correctly.

LightningTeg

With good knock detection shouldn't be problem. Same thing for part throttle...

OneBadTurboCRV

You use an Electronic Det-Can to solve that issue. A Mechanical Det-Can still has too much background noise especially when the wastegate opens (assuming dumps to atmosphere). With the E-Det-Can you hear only the internal sounds, much nicer.

h2.4

You reach MBT before you hear det. At part throttle it is even worse before you hear det, so......
I guess if you don't have means to a dyne, you could get the car running and close, a dyne is nice to iron out the part throttle sections and getting a more accurate timing curve. But it's all good.

h2.4

Nottheonion, turn your PM's on. Mbt, best timing. Some people go by Max brake torque. You will reach your max timing before det, if not fuel limited.

Dark_Teg

Change of plans. PRT Performance out of Lewisville TX will be dyno tuning my ride on a Mustang dyno first week of December!

wantboost

iTrader: (2)

That's a good thing.

Doing a 4th gear pull on public streets at that power level is asking to go to jail lol.

blackeg

job security for cops id call it!

ohsnapzafingcu

iTrader: (2)

i street tuned my 560 whp civic on the road by myself... once you tune say ~10 psi, the fuel maps pretty much correlate with the ~10psi fuel curve. If he's a good tuner he will tune it quickly, and safely.

good luck

ls joker

LightningTeg

I've been pulled over once doing it when a undercover mustang cop saw me turn around on a back road. Luckily I was having issues and only did a half throttle 3rd gear pull. When he came up to me he was like "I saw you turn around up there and knew exactly what you were doing" lol. I was prepared for the consequences. Just gave me a 88 in a 50.

welfarepc

Will he be able to know he has got maximum power? No.

Will he have a real world load on the car to ensure the tune is safe? That depends on traction. I dont think you can safely take that car to red line in 4th gear on public roads while being safe and respectful, and I bet you at 500whp it spins 3rd.


I dont think its gonna work out. If you can make the tires stick, the tune will be safe if he knows what hes doing.