AITs and AFRs and ****s

[blaze6]

hi,
i've been asked to post on here as well as apparently some very knowledgeble people are banned on mini2....
i was at 1320autos today to have the car dyno'd. my asc light was coming on alot so idecided to see what was going on. the car has had a bbr conversion consisting of a 19% pulley, gp intercooler, 380cc injectors, bbr cylinderhead, jcw airbox. bbr map.
on the dyno air intake temperatures were running up to 74 degrees C and the car was pinking as early as 4800 revs. boost was running in excess of 19 psi and that the AFR was lean most of the time.
i have to say these figures mean v.little to me. the expression on chris of 1320autos face was reminiscent of Dr. No in the bond movies "....you do not have long left to live Mr. Bond (or in this case my cooper s)...."
he essentially felt my car was an accident waiting to happen and recommended i switch to a 17%/15% pulley and upgrade the intercooler/injectors if i could afford to. then remap the car.
so i'm now sourcing various bits and bobs.
the car dyno'd 230 bhp/whp i'm not sure and 170 Nm at 7100rpm with heat holding back any further improvement in those figures.
one question: how close do RR figures match road driving. the fan's used on RRs can never match the wind velocity and cooling effect you would see if you were on a road going at high speeds. I was just wondering... i don't have the funds yet to get the kind of setups recommended by gizmos so i can see what's happening on the road, so i guess RR is the way to go. - better to be safe....
paul has since driven the car and the AIT's are slightly better but not much - under 5000 revs temps stay below 50. over 5000, they're peaking at 69 at 7000rpm. there's not much torque either low down, - ?related to the lightened flywheel hence there would be torque further up the rev range but temps too high & injectors are leaning out so getting no power???? anyway, he's going to check the cat and compression test the cylinders. . and get the intercooler cleaned.
i suspect i'm heading for bigger injectors + :-

either what gt tuning suggest - modding the fuel pressure regulator

or what 1320 autos suggest - a remap with 17% pulley.


if this isn't enough, what makes the 17% pulley more expensive is that i would need to buy a new supercharger. as the present 19/?20% pulley just won't come off that easy - gt tuning had one and they had to cut it off! so possibly a new intercooler-may be cheaper- but not enough.

fitting new supercharger+ pulley=3-4 hours labour + supercharger(£200) + pulley (£120) which i have but was going to sell on. ?£500

custom remap - £340 from 1320autos

injectors from jan:- £220 +vat
total:£1000+

alternative:
gtt: 440cc injectors+oil pump mod+live testing of AFR/AITs = £540


plus or minus the cost of the intercooler- prob GRS - £400 & 17% pulley anyway (£500)

so i'll probably spend the same amount either way.

SO I'M FEELING BUGGERED

COSTS SO FAR:

DYNO:£40
COMPRESSION TEST:?£25-30?? (if i'm getting 19psi it's highly unlikely i've got an air leak)


OTHER POTENTIALS: NEW CAT BACK - MILTEK £400 OR GET SOMETHING ELSE.

[Rigsey]

Whats the oil pump mod?

Never heard that before ..

I've heard about re-building the oil pump.

[batou]

If those are flywheel figures made more power and torque with the 15% Pulley and stock head, I run 380cc injectors and a 15% pulley.

I didn't realise you had 380's. "oil pump mod", are you sure were not talking about the AFPR (adjustable fuel pressure regulator)?

If it was my car I'd rectify the problem rather than trying to work round it. GTT option sounds like a gaffer tape solution, I've always trusted 1320 with my car as they deffo know best. It really sounds like the map and pulley are causing the issues (minimania dont even sell a 19% for good reason). Sounds like a lot of cash though

[blaze6]

Originally Posted by batou

If those are flywheel figures made more power and torque with the 15% Pulley and stock head, I run 380cc injectors and a 15% pulley.

I didn't realise you had 380's. "oil pump mod", are you sure were not talking about the AFPR (adjustable fuel pressure regulator)?

If it was my car I'd rectify the problem rather than trying to work round it. GTT option sounds like a gaffer tape solution, I've always trusted 1320 with my car as they deffo know best. It really sounds like the map and pulley are causing the issues (minimania dont even sell a 19% for good reason). Sounds like a lot of cash though

sorry,
yes, it's the ajustable fuel pressure regulator mod.i wouldn't say it's gaffer tape. a fuel mapto stop leaning out with injectors versus the AFPR with bigger injectors both address the same problem from different angles?

i have to say i don't favour a particular tuner interms of expertise. not when they ALL slag each other off (some do it subtly others not so subtle ".....scheisters..." for example) so it's very hard to know who's being completely accurate. they all come across as nice and personable. it's tempting to get some books on motorsport engineering and ecu programming and mapping and figure it out myself. but being a doc i don't have that much free time!

[Lucky]

Im running 19 psi of boost with my 17% pulley and my AIT never goes above 50 degrees.

I have a very good Air/Fuel logger including 4 Exhaust gas temp sensors.

Im running the Adjustable fuel reg (not oil pump) and using my logger I can run just what fueling I choose.

You need to get more fuel in either way to keep things cooler.

If your thinking of getting a custom map, its best to get all your other mods done before the map!

[Lucky]

At 19 psi the fuel pressure is topping out before the boost hence running lean at the top.

You can either reduce your boost OR replace the fuel regulator, a map alone will NOT cure the problem.

I hope that helps.

[blaze6]

Originally Posted by Lucky

At 19 psi the fuel pressure is topping out before the boost hence running lean at the top.

You can either reduce your boost OR replace the fuel regulator, a map alone will NOT cure the problem.

I hope that helps.

okay, replacing the fuel regulator? - is this easy to do? - is this what gt tuning does- is their AFPR a different fuel regulator completely??

[Jaw_F430]

Originally Posted by sayanthan

okay, replacing the fuel regulator? - is this easy to do? - is this what gt tuning does- is their AFPR a different fuel regulator completely??

It is a modified stock one (think it is on exchange basis) which allows you to pre-set the pressure, but I would go the other route to sorting your problem.

But its your choice at the end of the day

[batou]

Originally Posted by sayanthan

sorry,
yes, it's the ajustable fuel pressure regulator mod.i wouldn't say it's gaffer tape. a fuel mapto stop leaning out with injectors versus the AFPR with bigger injectors both address the same problem from different angles?

i have to say i don't favour a particular tuner interms of expertise. not when they ALL slag each other off (some do it subtly others not so subtle ".....scheisters..." for example) so it's very hard to know who's being completely accurate. they all come across as nice and personable. it's tempting to get some books on motorsport engineering and ecu programming and mapping and figure it out myself. but being a doc i don't have that much free time!

Cool AFPR is what Bhozar has I think. Sorry, "oil pump mod" sounded like a gaffer tape fix lol, I thought how can an oil pump modifcation help fueling?

[blaze6]

Originally Posted by Jaw_F430

It is a modified stock one (think it is on exchange basis) which allows you to pre-set the pressure, but I would go the other route to sorting your problem.

But its your choice at the end of the day

why do you say that, would be good to hear pros and cons of this so i can decid ewhat to do! - lucky thinks i need both, ie: a map and bigger injectors won't be enough and neither will the AFPR, ie i need all 3!