Jump to content
SAU Community

Recommended Posts

Hey guys, went to an SAUWA Dyno Day today, and the dyno print out showed some interesting results. The A/F ratio dived down below 10:1 and sat on the bottom of the graph for he magority of the run. The owner of the workshop had a look at it and reckons something is seriously wrong with it. Would explain the fuel usage recently. Any ideas what might be causing it? I would take it back to the workshop, but I dont trust them touching my car. No offence to them.

The car is a 1996 R33 GTSt with high flow turbo, full exhaust, intercooler, remapped ECU, stock BOV, Spitfire coil packs, 18psi through a Greddy Profec B Spec II.

Any ideas?

Rhys

Link to comment
https://www.sau.com.au/forums/topic/300039-rb25det-running-crazy-rich/
Share on other sites

Hey Ryhs,

I had the same problem where due to the heat today at the dyno (38degree day) my power fc chucked a whole heap of fuel in to stop it pinging and i ended up 60hp less than normal and afrs in the 10's instead of the normal 12's

Hmmm. So you reckon getting it checked on another dyno when its cooler? Like I said before, I'd buy a car and parts off Alistair, but I wouldnt trust him with my car. Possible he's trying to scam money off new customers?

Hmmm. So you reckon getting it checked on another dyno when its cooler? Like I said before, I'd buy a car and parts off Alistair, but I wouldnt trust him with my car. Possible he's trying to scam money off new customers?

Take it to another workshop to get it dyno'd that you do trust and see if the readings are the same?

Do it on a day without so much heat..

Hey Rhys,

My mate went to the same dyno day and he pulled a low 300 when it normally pulls 400hp

his was tuned by autoworx so i dont think its the dyno reading low, his AFR also dropped down into 10s

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

    • There's plenty of OEM steering arms that are bolted on. Not in the same fashion/orientation as that one, to be sure, but still. Examples of what I'm thinking of would use holes like the ones that have the downward facing studs on the GTR uprights (down the bottom end, under the driveshaft opening, near the lower balljoint) and bolt a steering arm on using only 2 bolts that would be somewhat similarly in shear as these you're complainig about. I reckon old Holdens did that, and I've never seen a broken one of those.
    • Let's be honest, most of the people designing parts like the above, aren't engineers. Sometimes they come from disciplines that gives them more qualitative feel for design than quantitive, however, plenty of them have just picked up a license to Fusion and started making things. And that's the honest part about the majority of these guys making parts like that, they don't have huge R&D teams and heaps of time or experience working out the numbers on it. Shit, most smaller teams that do have real engineers still roll with "yeah, it should be okay, and does the job, let's make them and just see"...   The smaller guys like KiwiCNC, aren't the likes of Bosch etc with proper engineering procedures, and oversights, and sign off. As such, it's why they can produce a product to market a lot quicker, but it always comes back to, question it all.   I'm still not a fan of that bolt on piece. Why not just machine it all in one go? With the right design it's possible. The only reason I can see is if they want different heights/length for the tie rod to bolt to. And if they have the cncs themselves,they can easily offer that exact feature, and just machine it all in one go. 
    • The roof is wrapped
    • This is how I last did this when I had a master cylinder fail and introduce air. Bleed before first stage, go oh shit through first stage, bleed at end of first stage, go oh shit through second stage, bleed at end of second stage, go oh shit through third stage, bleed at end of third stage, go oh shit through fourth stage, bleed at lunch, go oh shit through fifth stage, bleed at end of fifth stage, go oh shit through sixth stage....you get the idea. It did come good in the end. My Topdon scan tool can bleed the HY51 and V37, but it doesn't have a consult connector and I don't have an R34 to check that on. I think finding a tool in an Australian workshop other than Nissan that can bleed an R34 will be like rocking horse poo. No way will a generic ODB tool do it.
    • Hmm. Perhaps not the same engineers. The OE Nissan engineers did not forsee a future with spacers pushing the tie rod force application further away from the steering arm and creating that torque. The failures are happening since the advent of those things, and some 30 years after they designed the uprights. So latent casting deficiencies, 30+ yrs of wear and tear, + unexpected usage could quite easily = unforeseen failure. Meanwhile, the engineers who are designing the billet CNC or fabricated uprights are also designing, for the same parts makers, the correction tie rod ends. And they are designing and building these with motorsport (or, at the very least, the meth addled antics of drifters) in mind. So I would hope (in fact, I would expect) that their design work included the offset of that steering force. Doesn't mean that it is not totally valid to ask the question of them, before committing $$.
×
×
  • Create New...