still getting top end cut out (death)
Turbo Mini Forums

scott, when u used to have your problem was it leaning out on the afr? or would it happen then lean out?

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

at the time i didnt have a gauge in but swaped nedles & it was sorted job done when i had the problem it had a bdd reprofiled by u know who & fixed with a bca reprofiled

13.2:1 is not that lean, certainly not lean enough to do any damage, and certainly not causing the engine cutting out.

Thats my opinion too sproket

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

I found that the van seemed to run really well around that sort of mixture especially on low/med boost. We just used to aim on the rich side of 12.5:1 (more like 11.5:1 with our needle) on high boost for safety.

If something is worth doing, it's worth doing half of.

If you are a very low boost setup then high 12's may be considered ok.

Or if you are 100% sure each cylinder is at exactly the same AFR, then running lean mixtures can maybe be ok.

But I personally would never tune a turbocharged engine that makes any power in the 12's range. There is virtually no gain to be had over high 11's and the risk simply isnt worth it IMO.
Although in saying that, I dont think Ive tuned many engines that actually use less than around 15-20psi as their lowest setting

But you dont say how much boost you're running either. If you are even running boost ?

Edited by stevieturbo on 29th Nov, 2011.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

14psi spike and around 11.5 ish when it occours.

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

I hate to say it Stevie, but if you only ever tune for mid 11:1 AFR on high boost because you fear you may damage the engine with anything higher, then how can you suggest that 13.2:1 AFR is as bad as you make out if you have never tried it?

I know my tuner (a very well experienced and respected person in the industry) detests tuning anything lower than 12.5 and usually aims for 13s.

Oh, and IIRC, Matt Woods has on ocasion found that he has inadvertantly run close to 14:1 AFRs without damage.

I don't think the 13.2:1 AFR is of such great concern at this juncture, it certainly is not the reason for engine stall.

I never got an answer to one question though, what plugs are you using.

Heres another question. Are you using Megajolt, and if so, what is the coil charge time? High RPM, low charge time and incorrect plugs could see the spark being extinguished altogether.

On the other hand, if the float bowl is being evacuated because the fuel pump or regulator is starving it of fuel, the end result at high rpm and fuel flow, would be a sudden engine shut down without any warning. Where have you got the fuel regulator vac connection connected to the carb?

Edited by Sprocket on 29th Nov, 2011.

Cheers sproket, uve got wat I mean in 1.

Forgot to say bout the plugs the brass colord ngk's carnt remeber the code but there defore the 7s. Ive had them on the car for around a year with no issues. Maybe I should get a pic to confirm there resisted

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

No need for a pic, they will have an R in them if they are.

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble

BPR6ES's?

try loading on the coil, or as was mentioned the fuel pump or blockage in the fuel rail.

Bpr7es

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

As long as they are R's then you will be ok

None resistive plugs make the wierdest sounding misfire, like someone has a massive spoon they are smashing on the rocker cover.
They will cause the miss all through the revs

Not trying to sway the information, but I'm using non resistive plugs with megajolt with no ill effects.

If the plugs have been in there for a year and you have been having problems, why have you not changed them for new ones ?

I am ashamed to admit I ran on too soft a plug for a long while, fiddling with mixture -new plugs of the correct rating solved all my problems. Cheap and quick to try.

Edited by stevieturbo on 30th Nov, 2011.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Rite it wuld appear ive not got non resisted so thats the 1st thing im going to try now

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

ive changed the plugs plugs and its made the car run a little smoother but still the same top end problem,

so the head will be off in a few hours

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

Got the head off and will be visiting be benross for inspection

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!