Jump to content
SAU Community

Recommended Posts

Got a 34 gt-t with about 90,000 kms. Got a microtech in and with the way it's tuned at the moment i'm getting good power from when the turbo spools up (4000rpm) to redline (7000rpm). However the gain in power between 6000 and 7000 is unreal. A friend (300zx owner) tells me it is common to increase the factory redline and after reading a couple of threads it appears this is the case. Which interests me as i'd like to extend this power range.

So basically I'm asking if i can increase the redline, and if so, what's a safe limit.

R34 gt-t

Stock rb25det neo

650cc injectors

600hp garret turbo

hybrid intercooler

bosch fuel pump

splitfire coils

greddy intake manifold

3 inch dump with 3.5 inch rest of exhaust

Basically everything without touching the internals. Currently running 308 rwkw on 18 psi boost. If you need more info let me know.

Any opinions are welcome.

Cheers

Link to comment
https://www.sau.com.au/forums/topic/186244-increase-redline/
Share on other sites

After my car was tuned i noticed my rev limit was set to 7500rpm.

I dont hit the limiter often,it might happen when boost comes on in first and my foot is on the floor but i normally change before then anyway.

But to be on the safe side i might lower it to 7200rpm.

I rev mine to 7800 rpm, it starts to run out of puff by then anyway. I do however run a set of cams. Standard bottom end.

Maybe with that turbo you might try dropping in a set of sticks, make the power a bit earlier and not have to rev so hard.

308 rwkw might be leaning on the bottom end a bit, but R34s do run GTR rods, so maybe not as much as we think.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Latest Posts

    • Sounds like you've got an interesting adventure ahead here with local support if you have trouble! My guess is that, unboosted, you will be OK with a small upgrade like -9. What will happen is that once the stock ECU sees more airflow than it expects it will add a heap of fuel and pull a heap of timing to be safe because it can't understand how it could get that much air without there being an issue. You will see clouds of black smoke and it won't pull hard through the midrange and top end. So, overall it will be a bit frustrating but should be OK. If you are still nervous set the base timing back 2o through the CAS, but it will be even more sluggish everywhere. As said above through...this is not my guarantee your engine won't be blown into a million pieces, leaving you looking for very hard to find parts A better idea is get a computer with logging ASAP, wire in a wide band O2 sensor and a use remote tuner. I've done multiple cars this way and while it is not as good as a specific tune on a dyno they can get it 90% right. I'd suggest if you can afford an R33 GTR these days you can afford an ECU and tune. And if you can't afford that you sure won't be able to afford the rebuild if it goes bad in the meantime,.  
    • Yeah it would be nice if someone took the time to put that sort of information together, but there are a lot of variations in looms. I think you are making this way hard for yourself if you just want to get it running....sourcing an SR20 with the right wiring will be a billion times easier than matching the RB loom to an S15 chassis. If you do end up going this way, you just need to trace every wire in the loom with a multimeter, 95% of them will go to a location you can confirm at the ECU.....and then post it up for the next person who needs it  
    • Just top it up with water, and keep a general idea of how much you added. It is normal for water to be pushed into and pulled out of the reservoir through the cap, and it should not be more than half full or it will be likely to overflow when hot. Any decent mechanic can do a pressure test of the cooling system to confirm if you have a leak. Keep in mind if it is only leaking a little and when hot it may well evaporate before you see it hit the ground
    • I'd ask the shop what they used and use that. Mixing coolants is sometimes OK, sometimes not, and you have know the details of each coolant to know whether it's a good idea or not.
    • Is it alright to top up with just another green coolant?
×
×
  • Create New...