Wolf_gsxr

I would have thought so. I know that most mappers who do N/A cars usually time them up for the map as there often aftermarket cams. What plugs have you got in?

Shaun

Sorry to be blunt, but if he is one of the best in the country he should be able to tell you what the problem is or could be (so hence saving you time asking others that have no idea about your car). Surely the issues were discussed as part of the mapping session with you at the time or afterwards.

I sure for **** know my scoobies, but by going on what you have said it could of one of a ****load of mappers! lol Not that it matters who it is if I'm being honest.

spudboytim

iTrader: (3)

Its got a new set in, i think they were ngk 7's. Im going to have another chat with the mapper 2 moro to see if he can come up with anymore ideas??

spudboytim

iTrader: (3)

I understand what your saying about maybe the mapper should know more, im going to hav another chat with him 2 moro to see if we can shed anymore light on the subject. Like i said before i dont want to name him as hes done nothing wrong. But im more than happy with his credentials and alot of big name mappers/tuners recommended him when I mentioned my car had a gems ecu.

Galifrey

iTrader: (3)

Glad I am not the only one thinking that

spudboytim

iTrader: (3)

I'm happy that its not the dyno as the mapper said normally youd expect at least 320bhp from my set up on his dyno.
He should know i suppose as he uses it most days and has seen hundreds of cars similar to mine on the rollers.

Cheers tim.

LegacySTi

iTrader: (13)

A tired turbo?

Assuming its a side entry 16g.

305-315 about right imo.

As also said all dynos give different figures so dont get too hung up on it.

440cc with fuelab reg at 3bar on a 2L engine normally see 350bhp ok so should not be maxing out

d4vidh

Have you upgraded the fuel pump at all?

spudboytim

iTrader: (3)

Yes bud its got a brand new roger clarke 340 pump, so no problem there..

spudboytim

iTrader: (3)

Hi guys, just a quick update after speaking to mapper today he seems to think it could be one of a few things,

Turbo design (90 degree entry restricting flow)

Engine just wont give anymore with my mods,

Worn engine,

Cam timing.

Ive got a feeling that the cam timing could be slightly out, ive just spoken to my m8 who changed the cam belt when i bought the car 2years ago and he said that the timing was out when he did it !!!! But he didnt want to alter it as the car had previously been mapped with the timing like that.

It was a rally car running a restrictor in the turbo, i dont know if its a common practice to alter the timing for rally cars with restrictors or not??

Only trouble is ive got to pick the car up (4hr round trip), 2 check cam timing, perhaps do a leak down test etc.
Then if the timing is out alter that and take the car back to the mapper (4hr round trip) to see if its made any difference and perhaps tweak the map!!

The garage where the mapper works from are busy for 4 weeks so havnt got time to look at it, so leaves with me no choice but to bring her home.

Anyway i hope it is just a simple case of the timing been out and nothing more serious!!

Any more opinions or help much appreciated!!

addi monster

iTrader: (6)

why dont you pick the car up, sort the timing and call a mobile mapper like duncan to come and tweak it for you, will save you the 4hr journey and what you will save in fuel will nearly pay for the tweak,

steve

spudboytim

iTrader: (3)

Its a good idea bud, but my car isnt road legal so couldnt do a road

mapping session, and id like to see back to back results on the same

dyno. Its a ball ache but i suppose its gotta be done!!

Cheers tim.

TonyBurns

iTrader: (3)

So you still have the 34mm restrictor in there? (that would explain alot if you did )

Tony

spudboytim

iTrader: (3)

, Its long gone bud, slowly turing it into a track/sprint car so removed it.
I'M STUPID, BUT NOT THAT STUPID!

dynamix

iTrader: (3)

It would have been funny if that was it.

Have seen aftermarket exhaust headers cause issues like this.

Have you posted the dyno graphs anywhere? What was the fueling like ?

spudboytim

iTrader: (3)

Hi duncan,

thanks for the reply, im running gp spec headers and upipe all heat wrapped, have you seen a problem with this make before??

Also if the timing was slightly out would you expect to see something similar to what ive been describing earlier in the post, maxed injectors, poor power etc.?

I havnt got any dyno graphs but the mapper said everything was o.k but he just couldnt get anymore out of it, and was maxing the injectors (440's) at 303bhp.

Many thanks tim,

dynamix

iTrader: (3)

No, not with gt spec.

Took a set off a car yesterday (not gt spec) that were just horrid and stopped the car revving beyond 5200 they were that badly designed with build up of backpressure I would assume.

It does happen that some cars produce lower figures but that does seem like there is an issue causing the loss with it being that far below expected. Cam timing would be a good starting point but it would have to be quite a lot out IMO to be causing that. Have seen cars with belts 1 tooth out dropping a little power but not that much.

Any manifold or exhaust leaks ?

spudboytim

iTrader: (3)

Hi duncan,

I think other than the possible timing problem the car is fine, but will give it a good once over and check everything when i get it home!

List of checks,

Cam timing,
exhaust/manifold leak or restriction,
tired turbo,
intake and general pipework check,
compression/leak down test.

Anymore ideas of what i could check?

Thanks again for all the input guys!

Tim.

EngineMapper @ Group B Motorsport

You need to start at a basic level to check the car over for problems. First check is leak test over a compression check as it will tell you much more. Then check your timing. Make sure this is where you start, to be sure you are eliminating the fundamentals.

It's unlikely to be exhaust related I would say due to the high demand on the injectors and would concentrate on mechanical potential problems. However it may turn out to be a host of problems together. Check you don't have an overwhelming amount of oil coming through the intake system too.

Graham

spudboytim

iTrader: (3)

Hi graham,

Thanks very much for the reply, its great to be armed with the knowledge/help from people like yourself and duncan here on scoobynet!!!

Im bringing the car home on friday so ill get stuck in over the w.end and do the checks you suggest.

Hopefully ill find something that isnt too serious!!

I'll post up the results as soon as possible.

spudboytim

iTrader: (3)

Hi guys, just thought id post the findings/reasons behind the poor dyno

performance of my car. After getting the car home i checked the timing,

i found it to be out by 1 tooth on 3 cams!!! Very strange!!!.

But at least i had found the problem!!!! Or so i thought..............

Whilst i had the car in pieces i thought id do a leak down test,

Results.

CYL 1. 8%
CYL.2. 6%
CYL.3. 85%
CYL.4. 9%

So cyl.3 has a major problem, when doing the test i could hear the air escaping through the exhaust valve which leads me to think i have a head/valve issue.

So it looks like a engine out and strip down to find the problem and maybe have a refresh whilst we're in there!!.

The joys of scooby ownership!!

Cheers for all the help will post the findings when i get her stripped down.