Andy, how were your inlet temps ????? ..... probably you don't need such a big IC core ;).

Carlos H.

Hi Carlos........You're correct, I currently don't need such a big core ;);)
The overall system volume however is still less than say a MRT FMIC install due to the shorter pipe runs employed with the front entry/exit.

Andy, for example the FMIC core of the EVO 7 can easily take 400 HP, without any problem and it is not that big ;) ..... probably getting a smaller one than the one you are currently using might help the response time when changing gears.

Carlos H.

Andy,

Are you still running without a dump valve?

Andrew...

He's not the only one... sounds like hannibal lecter is under the car...

I would be inclined to put the dump valve back in. Perhaps the increased pressurised volume would then be dumped to atmos rather than stalling the turbo.

You could always produce an elaborate diverting pipe which vents the charge to the headers and blows the turbo round.

just twigged David, thats why yours sounds so sodding loud, its the all that chattering:D

I'm going to try a dump valve :) Thought about that Adam but I'm not sure if the thermal shock may be an issue ?? 800C turbine blasted with 20C air at 1.6bar :eek: Perhaps not ? David, you try it first ;)

andy,

depends where you join the headers.

I would be more concerned about the gas flow when the dump valve is closed, perhaps an internal exhaust (poppet?) valve might be the order of the day, to replace the dump valve itself with your own one.

If you merge downstream enough it will be heated pretty damn quickly. The volume of gas we are talking about, hence time exposure to turbine wheel will surely be nothing. In effect, it wont push the wheel very much therefore!!!

At least the expansion due to heating might increase the pressure further and push the turbine more effectively. :D

go on, try it. whats the worst that could happen? a repair on the TD05........big deal!

The air bypass system you are basically talking about is used on most WRC cars and is incredibly effective as part of an ALS system. The air valve needs to be pneumatically controlled like the wastegate rather than just opened by vacuum in the inlet manifold though. This is how high startline boost pressures are achieved (->3bar).
Dumping to atmosphere is wasting energy really. Either remove the DV if you've got a strong turbo, like I have done, or dump it into the uppipe before the turbo as you have been discussing. Beware though, this would need something a bit more temp resistant than your average DV!

Andy YHM

Sounds interesting to dump back to the uppipe ..... although this might need pretty strong materials to cope with the heat of an uppipe exposed to the use of antilag.

Carlos H.

Andy YHM too ;) ..... and this thread doesn't look to be too condensed any more :D

any news before going to the dyno ?

Not much progress, playing with boost profiles, tapping points etc.
I hope to try the idle valve mod this week sometime :)

Andy, are you dismissing the FMIC project ? ..... this is something you posted on another thread regardind lag between gears:

It is possible to fit a FMIC and bigger turbo which will give you, say 40bhp more but that combination will result in more lag between gears than the original little turbo and TMIC. If you calculate the 'average' power produced over the 1/4 mile then it can actually be lower <shock-horror>
Before you all say "my car has no more lag" can I politely say Bollocks, show me proof !
I have data logged this on 3 cars now, one of which was my own, and they all produced more power with either the bigger turbo and/or FMIC BUT, over 1/4 mile actually went slower !!!

This could be the case with Harveys ?? My own car is now 2mph slower over the 1/4 despite the fact I have 40bhp more now than when I ran 11.87 @ 118

Before anyone says 'lack of torque' it's not that. I have gained a few lb-ft and the boost now comes in even earlier.

or are you going back to the charge cooler, or better yet, are you going to try a smaller IC core ;)(no need to have tooooo low inlet temps) ?

Carlos H.

I was flickin through Demon Tweeks (Ahhhhh) and they are selling some universal intercoolers for about £234 dimensions 680x160x74...... Would these be any good ?

new home?

Scooby Racer, you sound like someone I know... ? :)

Simon

Carlos - Bit of a late answer (3 months later!) but now I've fitted the bigger turbo the big intercooler has become more appropriate to the rest of the set up.
I have not done an 'official' 1/4 mile yet but with a gentle launch in the rain the AP22 showed 12.4 at 121mph. The trap MPH being an indicator of the average power. ET being more related to launch and gear shifts.

Bottom line is it's staying on !!

Andy :)

[Edited by Andy.F - 2/14/2003 1:47:06 PM]

bigger intercooler, but what about a:

STRONGER G E A R B O X

:D

What would you recommend Carlos ? Don't mind a dog but I want a good one !

PAR synchro set should fit the bill ;) ..... a "good" dogbox is expensive :(

:D

unless you want to convert your WRX into a RWD ..... :D

ttt

RWD WRX should not be imposible to do, specially if you have the bigger R180 rear diff, which is the standard diff of both the Nissan 200sx and the 300zx.

The only real investment will be a good gearbox and adapting it .....

:D

Although if the diff is the same , it will probably only be the crownwheel and pinion.
I did have a 200sx diff apart some time ago, but the only thing I remember is that it was NOT and LSD. Cant say if it would fit a Subaru at all, as I havent yet seen an R-180 out of a Subaru to compare with. Just seen one from under the car.

R180 is not the LSD but the diff housing, and it is made be Nissan ;)