Bit disappointed with my RR result today
 

Had the car rolling roaded today at AJEC in Gloucestershire & was a little disappointed with the results. I thought the 440 injectors would be struggling but it appears to be running rich.

What do you guys think?

http://i5.photobucket.com/albums/y19...alve/tunes.jpg


VF48
FPR
FMIC
Magnex headers
Harvey's stainless up pipe
3" exhaust
GEMS ecu

An 09 plate FQ360 made 333bhp & everybody seemed to be down generally but I was hoping for another 25 bhp :confused:

i agree,i would have expected a bit more than that.

Definetley would have thought you would get more than that,my old 99 uk turbo with std headers,tmic,std uppipe,vf28,& 2.5" exhaust made similar power as yours did.:Suspiciou



http://i782.photobucket.com/albums/y...Powergraph.jpg

Hmm, mine was mapped 2 weeks ago by Bob albeit on 97 RON but still..

I was hoping for 350, I would have settled for 335 but 312..?!

what mileage?is the engine standard?

Does seem low for the mods fitted and a vf48,I'd get in contact with Bob to discuss it.:thumb:

Bob who? What RR? How does the car feel?

think of it as good news! when you find out why it was low...you'll gain another 30BHP!

Mmmm looking at your boost curve that looks a bit suspect to me.

It peaks at 1.5 bar but holds it for no rev range and seems to drop straight off.

Whereas my vf34 peaks at 1.5 bar and holds it all the way to 5.5-6k revs on my print out.

Can't see it being a mapping error as bob certainly knows his stuff.

Boost leak maybe?

Could have a point re boost leak as it felt v rapid after the map but has got gradually slower.
There was a split on the induction pipe that was repaired - don't know whether that has any bearing?

56k miles on cdb & standard internals, V4 STI Type R

Definetley a problem somewhere then as my map is from a car that had 134k on the clock :wonder:. Are you sure, you repaired the intake pipe leak :Suspiciou ,same thing happened to me and i just replaced it with a 2nd hand samco unit which was cheaper than an o/e intake from subaru. :thumb:

South Wales Scoobies had a R R day there last year and nobody was happy with the results

Think I'll buy a Samco hose - anybody got one as well as some 550cc injectors to sell me??

looks like a boost issue, dropping way off for some reason, heres mine of a vf34, also perhaps a tad rich

http://i14.photobucket.com/albums/a3...ods/wheels.jpg

Ajec racing are incompetent, they RR'd a SWS members car that had achieved a proven 454bhp and they made it just under 410bhp from memory.

The car went back to Surrey Rolling Road and made 454bhp again, let's just say none of us will be using Ajec again. :cuckoo:

And the high ambient temp wouldn't have helped either. :)

Hi all, unfortunately Ajec's rollers always produce low relative results, suggest you go to Surrey Rolling Road, A typical difference would be about 10% which would lift you to more like the correct area. Power isn't just about boost btw. The intake pipe repair would not cause a boost drop in itself, but check around to make sure something else is not leaking. You could also have a cracked exhaust housing on the turbo which is worsening.

cheers

bob

Agree with Mr Fodder. We had a rolling road day there and everyones car was 20-30 bhp down. Thats comparing the figures with Powerstation's rolling road, who are known to be conservative also, so its not as if we were comparing to "Ramped Up" figures. So don't be so disheartened, i'm sure if your that worried Bob will check the map for you. :) The MLR boys don't use AJEC anymore either...for the same reasons.

And they can't strap down cars properly, when my car was there it can be seen skipping
sideways on the rollers.

It may be a little unfair to shoot the messenger in this case.
The small details are what matter if you're looking for maximum output in any situation.
Going back many years ago, I got similar stick over this kind of thing on MLR. I stuck to my guns and was proven spot on correct in what I was saying about the conditions, car set up and test procedure.
The DD dynos are very consistent, one of our "dyno queen" customers had three graphs from various cells within a 3 bhp range. It does depend on procedure like any other test, tie down arrangements, that sort of thing.
We've no interest, either way, in power figures from any other dyno, on the basis that the DD dyno has a deliberate design strategy to assist consistency and the others don't.
I haven't yet met a mapper who likes the idea of his work being scrutinised on someone else's dyno, especially if the figures don't match up! We've had a few spats on that front, and now appear to have reached an understanding ..:lol1:
Looking at the spec, and considering Bob's done 500 of those, my call would be that something's wrong with the car, albeit small.
I bet if you contact Ajec, they'll help you find the answer, as we would.
Personally, I'd test it again in fourth gear and move on from there.

Ignoring the bartop ammo...

How does the car drive on the road ?

dunx

P.S. Mine has never made the grade on a dyno, but she's capable enough on the tarmac..

Well, maybe we could fix it at both ends?

Thanks for everyones input, I do appreciate all the replies & without this forum I wouldn't have got this far.

I'm not blaming anyone - I put the car together & people can only work with what I've given them. The VF48 is from the guy in Ireland that has a few for sale with the supposed 20 miles on, so I would hope it's not cracked - I've done less than 200 miles! It did look rather scruffy though with some play in the bearing, both directions..

An F reg MR2 with 122bhp standard made 114.7 bhp yesterday so maybe the rollers weren't too bad as a 7.3bhp loss over 22 years seemed fairly good but I hear what you're all saying.

It was suggested that it had been mapped on the safe side & could be tweaked but I'll do a thorough check for boost leaks, put a new hose on, some larger injectors & book it in with Bob for another look. It does seem to have lost it's urgency though.

As Manuel said to Basil...

"Evenshually"... :lol1:

dunx

P.S. Decided not to try it at York Dragway yesterday... :thumb:

:thumb: On the money there Father, whilst 3rd may be correct in higher geared UK99 on cars, a Type R should ran in 4th as it has much lower ratios.

Martyn

How are you controlling boost fella? Mine dropped away like that when I was using a HKS EVC boost controller (no one knew how to work it!) so I took it off the car & replaced with a 3 port ... holds boost fine now.

TX.

It's a 3 port. Can't find a boost leak anywhere - pressurised the system with a compressor to 1 bar & couldn't hear a snake anywhere!

I'm wondering if the recirc/dump valve could be bleeding through?

Thinking about it the old VF22 boosted to 25psi absolute then settled at 20psi

How does your car feel on the road? I took my last car which was a 350z on a rolling road and it made 274bhp. Took it to another rolling road and it made 288bhp. It was a bit of a mystery until a specialist said rolling roads will always differ to another rolling road, sometimes by quite a lot. depending on how they are calibrated. For that reason when modding always best to stick with one rolling road to assess progress as the rr will always be consistent with each run but of no use comparing to other rolling roads. Best to speak to your mapper or take it to a specialist to check for a boost leak. It really does come down to how it feels on the road though.

Glad we agree on something Son! :lol1: