FD Uprated intercooler - suggestions please

spanerhed7 · September 01, 2004, 09:38:59 PM

So the state of play is 92\' FD nicely rebuilt and ported by WGT a couple of thousand miles ago, also has big exhaust, HKS filters and an Apexi PFC and a nice new set of Toyo R888\'s bought today!. I reckon the intercooler is the next weak link although I quite fancy water injection as an interim. What I need is just to add some safety margin for running track days with a bigger better intercooler - thing is I don\'t really want to shell out another Â£600+ if I can adapt something from another car.

Has anyone done this? think this is the right step next?

cheers

maximtaylor · September 01, 2004, 11:31:40 PM

Why not try water injection alone? It would be cheaper and should work well on stock twins.

Get the quantity right (about 10% - 15% against fuel going in) and it should work very nicely!

Just a suggestion, it\'ll save you a bob or two!

GaryS · September 02, 2004, 06:14:43 AM

If you go for a large intercooler, then you\'ll also probably have to look at your fuel system and, if you do not already have one, a programamble ECU.

spanerhed7 · September 02, 2004, 08:12:43 AM

QuoteOriginally posted by maximtaylor
Why not try water injection alone? It would be cheaper and should work well on stock twins.

Get the quantity right (about 10% - 15% against fuel going in) and it should work very nicely!

Just a suggestion, it\'ll save you a bob or two!

Have you tried water injection? I had a home made kit on my TII and it worked well. It did add 2 to 3 psi of boost also.

davefrith · September 02, 2004, 09:12:32 AM

QuoteOriginally posted by GaryS
If you go for a large intercooler, then you\'ll also probably have to look at your fuel system and, if you do not already have one, a programamble ECU.

he said he\'s already got a PFC

An intercooler is a good way to go, remember to cost for fitting as well as front mounts are a pain

GaryS · September 02, 2004, 06:21:49 PM

QuoteOriginally posted by davefrith
he said he\'s already got a PFC

An intercooler is a good way to go, remember to cost for fitting as well as front mounts are a pain

But not uprated fuelling. Remember 100% injector duty cycle normally means a big bang and a large bill.

iaint · September 02, 2004, 10:44:14 PM

QuoteOriginally posted by GaryS
But not uprated fuelling. Remember 100% injector duty cycle normally means a big bang and a large bill.

I\'m sure 100% is okay - problems arise when it tries to go to 101%

Iain

antnicuk · September 02, 2004, 11:03:03 PM

I would like to see you persuade an injector to run at 100% with out the engine going bang:rollin

When i was adding injectors to my TII i put 12v DC into an injector to test it, with in seconds, it was too hot to touch.

I know fuel will obviously keep it cool, but if it runs at high % cycle it must heat the fuel up. Just something else to ponder in the everlasting search for safe power in a rotary!:confused:

Fish · September 03, 2004, 04:35:32 AM

QuoteOriginally posted by iaint
I\'m sure 100% is okay - problems arise when it tries to go to 101%

Iain

I wouldnt want to see anything above 90%.

Fish

iaint · September 03, 2004, 09:13:25 AM

Cool (or hot!) - would never have thought that they\'d get that hot that quickly!

on 0.9 bar mine are peaking at 87% so that\'s happy.

If, hypothetically speaking, one were to upgrade the intercooler (maybe something v-mount sized rather than full fmic sized) and didn\'t have the resources to sort fuelling completely (i.e. pump and injectors) would running at 0.7 bar boost be possible to keep fuelling safe? Would running a bigger pump/pressure regulator be possible without upping the injectors?

Iain

Fish · September 03, 2004, 01:26:59 PM

That would be a short term fix.

Fish

iaint · September 03, 2004, 03:07:47 PM

That\'s what I was wonderin\'

Iain

spanerhed7 · September 04, 2004, 04:09:53 PM

Bigger injectors? Why would I have to alter the fuelling by changing the intercooler? The amount of intake air and threfore fuel air ratio would be unchanged, wouldn\'t it?

The initial thought was to reduce intake temp for more safety margin, thats all.

I already have an apexi pfc and tweaked map for the ported engine. Presumably though, if I where to put a bigger i/c in, I would then have potential to run more boost/power and thus require more fuelling, yes?

Fish · September 04, 2004, 07:57:30 PM

Putting a bigger intercooler on will lean out the fuelling.

You might just get away with fitting an uprated pump and FPR.

Fish

Shark · September 04, 2004, 08:18:01 PM

wouldn\'t this depend on the size/effectiveness of the intercooler though? :confused:

Lower intake temps = more oxygen in the same volume of space at the same pressure. Granted that means more fuel, but not necessarily lean running if your injectors/pump/etc. have enough capability in them?

or have I got it all wrong again...:rolleyes:

P.S. - how do you measure the injector cycle duty?