Boost Pressure Question...

[Jimlad]

Bibbs... I remember a while back you told me what different readings meant.

So 1bar = ??

15PSI = ??

1.0kg/mc2 ... ( or whatever it is ) = ??

thanks.

I just got my nice gauge in and don't really know what it's telling me...... lol

[Jimlad]

bump

[Dame]

1 bar = 15 psi, 2 bar = 29 psi, 3 bar = 44 psi etc.

As for the kg/mc2, not sure what this is. Could you check you have read it correctly off your gauge?

[Jimlad]

where the big 1.0 is ..... kg/cm2

what is the 1.0 in psi ?

[KiwiMR2]

where the big 1.0 is ..... kg/cm2

what is the 1.0 in psi ?

1.0 kg/cm is 14 psi :) That's what I run stock...then I up it to 1.2-1.3 kg/cm when I need to...whic is 17-18 psi.

I'll put the link up tonight with the online converter :)

Cheers

KiwiMR2

[Bibbs]

kg/cm2 is the same as Bar (to about 99%) ..

So 1 Bar (or kg/cm2) is about 14.5 PSI ..

On a Rev1/2 - it should be 14/15 PSI on stock cooling/turbo.

17/18 with WI or better IC.

A new turbo is a whole different story .. and the Rev3+ were about 4 PSI higher ..

[Bibbs]

Oh and -1 bar is about 70 cmHg I think ..

At idle the dial should point to 50/60 (6 o'clock) .. and on full boot mine points to 1.0.

Your will probably be a bit higher as you have the chip etc ..

[KiwiMR2]

On a Rev1/2 - it should be 14/15 PSI on stock cooling/turbo.

17/18 with WI or better IC.

Gen I and II 12 psi fuel cut, 18 on Gen III right.......IMHO STOCK CT26 I'd run NO more 1 kg/cm....with a W2A setup 16 or 17 max.......CT20B upto 1.3 kg/cm STOCK, 22-23 psi with W2A. Jimlad...did you ever find out if your chip gives you fuel maps above 12 psi??

Cheers

KiwiMR2

[Jimlad]

In 3rd I got the needle just going over the 1.0 bar before I changed to 4th gear.

This is with stock cooling etc, etc...

So the chip does obviously increase the boost pressure etc...

So I take it I'm quite safe at what I'm getting at the moment ? Any higher and I would have to get better cooling right ?

How could I actually get it higher ?? Better cooling... then a bigger turbo ?

[Dame]

To get it higher.... Well a number of things spring to mind....

Bigger Turbo, standard turbo on Rev 2 topps out at around 15 PSI.

Possibly Bigger Intercooler / Water colled Intercooler

Bigger injectors

Uprated Fuel Pump

Uprated Clutch (standard one good for 300 - 350 BHP)

Uprated Brakes (most important - You have to stop!!!)

Then.....

Uprated (forged) Pistons

Uprated Pushrods

Uprated Cams

Get the head gas flowed??

Um...... and probably other stuff I've missed. Oh and you will almost certainly have to pay higher insurance for all of this, I know you've been told you can do anything without affecting the Premium, but I would check for e.g. going from say 225 standard to 350 is no small powerr gain!!

All of this will cost loads, some owners report spending in excess of £10,000 on engine work. Granted they end up with a !Removed! fast car, but I would buy something else, something faster like a TVR, Supra or something..... You'll never recoup these sorts of costs!!

[Jimlad]

ok.. what could I do that would cost the least amount and give the best increase in bhp ?

Like you said... I would never re-coup the costs so I would rather get a supra or something.

I've had this going round my head a few times.... spend money.. or get supra....

I'll get the bodykit and respray then that might be as far as I take the MR2.

[Bibbs]

what could I do that would cost the least amount and give the best increase in bhp ?

Water/Methanol injection .. I think Dino @ Owens has a kit .. £400.

This sprays a fine mist of Water & Methanol into the IC pipe behind the IC itself.

This does two things .. the first is the water drops the temp of the air - so less chance of detonation. This robs the car of power.

The second is the methanol ups the octane of the fuel - this counters the drop in power.

You can then up the boost (via re-mapping the chip) to 17psi and you'll get an extra 20/30 bhp ..

[KiwiMR2]

You can then up the boost (via re-mapping the chip) to 17psi and you'll get an extra 20/30 bhp ..

on the stock CT26....I doubt it, Im sure most ct26 dyno results show no more pwer being made after about 15 psi.

Cheers

Kiwimr2

[Bibbs]

I've seen evidence that it does!!

I'll let you all know in 2 weeks when it gets onto the dyno.

No chip, stock turbo and no new internals - should be fun.

[Jimlad]

I hit 15PSI , then that's it... can't get anymore from it. Don't know if it's because of the chip or simply if that's all I can get from the stock turbo.

Not sure if the chip has a new limit of 15PSI, or if it simply has removed the limit. Will query this when I get my Apexi Induction Kit fitted.