JamieJerkovic

iTrader: (9)

Hello everyone,

Last month I had my 2003 WRX remaped along with the following mods,

VF34
STI Pinks
STI TMIC + Undertray
Full Decat Inc Uppipe
K&N Panel Filter
Harveys 3 Port
Ecutek Remap

The car was remaped at powerstation at it made 321bhp/280 ft lbs

To be honest I was expecting a little more than that! I've seen simular members on here with 340/330 with simular mods with a vf34 and get good figures.

Why do mine seem low?

Thanks Jamie

greatgonzo

iTrader: (1)

What did the mapper say?
Did you tell them you wasnt happy with the figures?
How does it drive?

IainMilford

iTrader: (15)

Hi Jamie

Those figures seem ok, I have pretty much the same mods and got very similar figures when my car went on the rollers at PS a few years back, I got 326bhp, cant remember the torque but similar.

First off, being around 10bhp lower than other figures yo have read about is nothing really, different conditions on the day will make a difference, plus people rounding figures up, plus every car and engine is different and the same mods on one car may produce very slightly different results on another.

Secondly, torque figures at PS in my experience always come out quite low, not just on my car but on other cars as well, so I wouldn't worry about it.

Galifrey

iTrader: (3)

Unless it was mapped on the same day on the same dyno, the difference is meaningless. Dynos vary hugely in their quoted figures so you may stick it on the same dyno on the same day as other peoples and even beat them when their printout shows more.

JamieJerkovic

iTrader: (9)

He said that they were good figures for what I have done, and the car drive amazing. Not going to lie I'm over the moon with it! Just I thought the figures seemed a little low.. Specailly the torque! Was hoping for over 300 ft lbs. I've read that rolling roads vary.. So I have nothing to worry about?

JamieJerkovic

iTrader: (9)

I wouldn't mind being closer to the 350 mark well just under it! With simular torque.. May change my exhaust and maybe get ported headers

The Pink Ninja

iTrader: (23)

When I had my bug wrx with simaler mods, exhaust, panel filter, STi top mount, STi pinks, vf35 and an open source map it made 331/329 on pro sports rollers in Manchester, I would have expected it to make a simaler figure if not more IMO, I know the rollers can play a part and obviously the mapper also atmospheric conditions but still 280lbft is low IMO

IainMilford

iTrader: (15)

Jamie I've 347bhp 343lbsft on Interpros rolling road, 326/300ish at PS, 305/290 at Ajec racing then found out I had a boost leak!!!

RR will vary, temperature on the day, tyres slipping on the rollers etc etc, at this level as long as the car feels nice to drive I shouldn't worry.

We (BBS) are planning a RR day at PS beginning of Feb, why not sign up to our site and come along

JamieJerkovic

iTrader: (9)

GAZ2293... That's the sort of figures I was expecting but seem quite off that!

Iain.. Wow your figures do vary! I can see what you mean different variables effect the figures... Just want mine boosted up abit. Yes I'd be intrested in that, what's your website? How many of you attend?

Galifrey

iTrader: (3)

Remember power is a multiple of torque, so to increase BHP with the same torque you would need to increase RPM while maintaining that torque.

BHP is a theoretical figure, torque is the figure they measure, so look to increase torque and maintain that through the same rpm range to get your BHP increase.

JamieJerkovic

iTrader: (9)

So how do I do that? Will that be down to who ever maps the car next?

IainMilford

iTrader: (15)

www.bbscoobys.com i should expect around 30 cars will go on the rollers

wrx271

iTrader: (1)

I wouldn't worry about the figs as long as it drives bang on then it's only a number at the end of the day a mapper will normally tell you if he thinks it's down etc so enjoy it

ade_sti

iTrader: (2)

What boost is it running?

EngineMapper @ Group B Motorsport

Post some graphs, specifically boost and fuel if thats possible?

Peak torque is a function of boost and RPM, the lower the RPM where peak boost is made, the higher the torque figure usually is as a general rule of thumb.

What size exhaust do you have?

It also depends greatly on how good a condition the turbo is in also.

Graham

JamieJerkovic

iTrader: (9)

1.34 bar boost...

I was told that I wouldn't need a uprated fuel pump aslong as my one was okay, it was tested fine so I still have the orignal!

Ill try and get some graphs up for you

New_scooby_04

iTrader: (4)

Assuming the condition of the turbo and your engine, your spec is missing a couple of things IMHO which got my old VF 35 (which slightly less top end than a VF34) to 338 bhp and 343ft lbs

1) FMIC - the purpose of which is not to gain power per se, but often yields more power and torque as the mapper can increase the boost and igntion advance with one fitted. I gained about 20bhp and 30 lbs ft torque with this replacing a TMIC (after mapping) with no other changes to the cars specification

2) Ported headers often release good torque gains and can help spool.

Try not to get too caught up with chasing figures though - if the car drives well then it's all good.

Ns04

addi monster

iTrader: (6)

post your dyno graphs up jamie so we can take a look,.

EngineMapper @ Group B Motorsport

For me, what would be in question is the torque figure. Which none of the above is helped with. Torque is improved with boost, quicker spool and ignition timing.

Graham

JamieJerkovic

iTrader: (9)

I will try and post the dyno graph up tomorow! Just concerned why my figures are a lot lower compared to the majority of cars with same mods...
Yes I don't want to be chasing figures as I could be doing that forever! But with the mods I have done I should be expecting a lot more torque and a little more bhp. Weather its down to the mapping I'm not to sure.

I don't think I really need a front mount as of yet. Then again I haven't looking into one regarding what I need etc..

But ill try upload a graph tomorow and hopefully go from there

Thanks for all your input!

Hope we find out why

New_scooby_04

iTrader: (4)

You seem to be contradicting yourself by referencing my post, Graham.

If an FMIC allows the mapper to dial in extra degrees of ignition advance over the TMIC set up then that should be good for torque. (Got an extra 5 degrees of advance with my car with the FMIC)

If torque is related to early spool and ported headers can improve spool....

Am I missing something?!

EngineMapper @ Group B Motorsport

Sorry yes ported headers will probably help, but you aren't hindered in the standard configuration of intercooler and headers to get torque. FMIC only hinders this as spool is decreased. Just as peak boost is reached the TMIC air intake temperatures are still very stable as very little heat is generated initially. When the turbo has been on boost for some time, i.e a full throttle run, then the FMIC shows it's true colours vs the TMIC at peak power by keeping the temperatures more stable.

Graham

New_scooby_04

iTrader: (4)

But wouldn't slower spool with an FMIC (has anyone quantified this for a given turbo, because I never noticed any difference when I went to an FMIC on a classic or newage) be offset by a significant ignition advance? I got 5 degrees over the TMIC......seems like a large increase to a layman...

The Pink Ninja

iTrader: (23)

Yes Jamie I think something is a miss as you seem to be loosing about 50lbft somewhere, Just for your info on my last motor the 329lbft was at 4450rpm running 1.45bar of boost, with virtually the same spec excluding the 3 port but i had a prodrive sports cat, Just to give you an idea, Though i would expect the VF34 to spool a tiny bit quicker, Have you had everything checked as in boost leaks, Hoses etc,

EngineMapper @ Group B Motorsport

I would have to say that being able to get another 5 degrees of ignition timing in where peak torque is, has relatively little to do with the use of the FMIC. It's a different matter at top end.

I have a graph somewhere of the same spec of car with just a FMIC change. I'll pull it up when I have a chance.

Graham

EngineMapper @ Group B Motorsport

Here we go, I put the effort in so you must appreciate it!

Below is with TMIC:


This is then with a FMIC, 300-400rpm later peak torque, with the torque only increasing by a small amount, but peak bhp increasing by a larger proportion:


Graham

scooby2.5maz

iTrader: (16)

Hi Jamie , those figures are good ! Like you said if it feels awsome on the road that's the main thing ! My rb5 made 322 bhp x 290 torque on powerstations rollers ! No doute you may see a different figure on other rollers !

Bob Rawle mapped it running 1.45 bar and his guestimate was 335x321 !!


My car has gone in now for engine rebuild so ported headers will be up for sale ! Just message me if you need anything !!


Cheers maz

IainMilford

iTrader: (15)

boost seems bit low jamie, but i would want to upgrade the standard fuel pump before upping the boost, and like graham has said power will depend on the condition of the turbo, was it new or secondhand? Also remember torque figures at PS are known for being on the low side

scooby2.5maz

iTrader: (16)

Turbo was taken off my rb5 so second hand and almost identical figures to what my classic made at powerstation !!

L.J.F

iTrader: (31)

Each car will perform differently to the next mate, never assume a set figure because half the time people end up wrong. If you are really that concerned that something is amiss then i would start looking for a boost leak, get a compression test done aswell just to be safe. What condition was the turbo in and was it checked for any cracks etc before being fitted? When was the spark plugs last changed?