Jump to content
SAU Community

Recommended Posts

  • Replies 77
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

The car back fires a bit now, is this a common thing?

Not sure if its related to the rear muffler or tune related. Its like its throwing out unburnt fuel on deceleration. Its extremely loud

What ecu are u using?

Its a Wolf 3D V4, and a turbosmart raceport atmo BOV was put on with the rest of the gear.

Its only back firing in the lower revs driving normally around town, it doesn't cough or blow flames on WOT

It doesnt run an AFM its a MAP sensor setup

Edited by GotsWapan

I've heard the japs don't even use AFR they just use exhaust temp and go rich as hell and smash the timing into the motors.

This is good. Engines out of cars should be able to be used in boats...... and held flat for a day or 2.....

They live long and happy lives then.

Wow, ile show you a pic of my SR20's piston when I tuned it to 12.5:1, half the side of the piston melted lol was at 18pound though. I'd never tune above 12:1 now.

what is your peak timing @18psi? what where the egts?

The difference between 2 degrees of timing to effect detonation is as much as going from 12.6:1 A/F ratio to 12.0:1 (or 12.0:1 to 11.4:1).

what is your peak timing @18psi? what where the egts?

The difference between 2 degrees of timing to effect detonation is as much as going from 12.6:1 A/F ratio to 12.0:1 (or 12.0:1 to 11.4:1).

I found something similar in practice, on a hot day with my old tune 3rd gear ~18psi rattled like crazy, could hear the det without knock ears, a minute later 2 degrees out of peak torque and we could idle the car for 10 minutes getting the coolant >85c and it still wouldn't ping in 3rd even listening on the ears.

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



  • Similar Content

  • Latest Posts

    • I mean this in no disrespect to u mate; Are there clear tagged examples/explanations in our SAU forum for example, in my interest, this is how to do R34 Gtt suspension the right way? U guys did so much taking risks with experimentation that deserves recognition and those results helps us morons take the RIGHT path to buy quality / buy once. 🍻
    • Pretty much what you'd expect at that power level. Hypergear turbo, long list of supporting mods, full Haltech catalogue, etc.  I'd say this goes for most drivers, suspension is still a dark art for most people. And it's really hard to convince someone how much better their setup could be...  
    • They are what I will be installing. 640s for me.
    • Hmm... From my experience you get about 0.25° camber change per mm of RUCA length change. So, to correct from -2.5 up to less than -1° (or, more than -1° if you look at the world as a mathematician does) then you'd be making 6-8mm of length change on the RUCA. From a stock length of 308mm, that's 2-2.5% difference in RUCA length. My RUCAs are currently very close to stock length - certainly only 2-3mm different from stock. I had to adjust my tension arms by 6mm to minimise the bump steer. That's 6mm out of 210, which is 2.8%. That's a 2.8% change on those, compared to a <1% change on the RUCAs. So the stock geometry already has worse bump steer than is possible - you can improve it even if you don't change the RUCA length. If you lengthen the RUCAs at all, then you will definitely be adding bump steer. Again, with my car, I recently had an unpleasant amount of bump steer, stemming from a number of things that happened one after another without me having an opportunity to correct for them. I only had to change the tension arm lengths by 1mm to minimise the resulting bump steer. (Granted, I also had to dial out a lot of extra toe-in in the rear, and excessive rear toe-in will make bump steer behaviour worse). Relatively tiny little adjustments having been made - the car is now completely different. Was horrifying how much it wanted to steer from the rear on any significant single wheel bump/dip. And it was even bad on expansion joints on long sweepers on freeway entry/exits, which are notionally hitting both rear wheels at the same time. My point is, the crappy Nissan multilink is quite sensitive to these things (unlike the very nice Toyota suspension!). And I think 99.75% of Skyline owners are blissfully ignorant of what they are driving around on. Sadly, it is a non-trivial exercise to set up to measure and correct bump steer. I am happy to show my rig, which involves nasty chunks of wood bolted to the hub, mirrors, lasers, graph paper targets and other horrors. Just in case anyone wants to see how it is done. I'll just have to set it up to take the photos.
    • What do you have in that bad boy ? Ill go with the 725cc since I'll be going with Nistune ( would definitely like more engine protection but Haltech is too far out of reach at the moment... plus, Ill probably have a pretty safe tune as its a daily, not gonna be chasing peak power 24/7 ahahah ). Are Xspurt a safe choice?  Pete's great. He didnt mention anything about traction arm length so I reckon it may be good. When I get some new wheels/tire later down the road I'll ask him about it and get his opinion on em. I heard from Gary that you've got the bilsteins too, are you running the sway bars too? and what other suspension goodies do you have installed or would recommend?
×
×
  • Create New...