Power boost valves?

CVH and Zetec tuning, suspension and braking mods.

Postby Richards MGX on Mon Feb 17, 2003 10:08 pm

Thought you were going to suggest / ask something at that point... :)
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Postby zetec_si on Tue Feb 18, 2003 12:15 am

Had the kit since last May. Been doing it since. It is so much faster when cold. Was frosty this moring, got in, started up, got to first junction and pulled away, Pulled away and accelerated fiercly. Did the same for the next few junctions but then started to be more hesitant.. :(

Another thing, anyone else with an Si find it hard to spin the wheels? My 1.1 could do it pi!ss easy, really sharp bite on the clutch.

In my Si if u get some revs up and quickly lift the clutch it slowly bites instead of spinning the wheels.
Mk3.5 1.6 Si -> 2.0 Zetec Conversion - SOLD :(
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Postby Quantum John on Tue Feb 18, 2003 2:39 pm

Sounds like your clutch is going.
By the way, reving the engine hard when it is still cold will serious reduce the life of it. The oil is not warm until several miles after the water and therefore temperature gauge has reached normal.

The power boost valve IS a fuel pressure regulator. If your car is running lean it should not be used as the solution although it will help slightly. You need to adjust the fueling to stop it running lean rather than just increasing the pressure.

I have an FSE one on my car for only 2 reasons. 1)It is a little easier to adjust than than the standard one for fine tuning on my ZVH and 2)it has an adpator so that it can be located elsewhere in the engine bay instead of on the end of the fuel rail.

John
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Postby zetec_si on Tue Feb 18, 2003 11:52 pm

Na m8. You must think I'm the sort that just always rants my car down the road. :rolleyes: Beleive me I saved a lot for this car and bought it with 24,000 miles on it. Didn't spend all that to just reck it.

I mean that it moves up throught the revs a lot faster when cold and is very responsive compared to when warm.
Mk3.5 1.6 Si -> 2.0 Zetec Conversion - SOLD :(
MKIV Supra, S362 Billet Single Turbo (624.7HP/520ftlb) - http://www.youtube.com/user/MrG33kman
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Postby Quantum John on Wed Feb 19, 2003 12:44 pm

If you haven't had it on rolling road - get it to one. Spending the money on a decent rr session will identify why you are having the problem and hopefully rectify it as well. It may just be getting a better cold air feed to the induction air filter. It is money well spent because if it is running lean it isn't doing it any good.

HTH,
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Postby zetec_si on Thu Feb 20, 2003 12:41 am

cheers for the help m8. Anyone know a rr place near bristol?
Mk3.5 1.6 Si -> 2.0 Zetec Conversion - SOLD :(
MKIV Supra, S362 Billet Single Turbo (624.7HP/520ftlb) - http://www.youtube.com/user/MrG33kman
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Postby Project on Thu Feb 20, 2003 1:23 am

From the middle of Fast Ford mag:

Alan Jeffery (South West England) - 01752 345880

Carburation and Injection Tuning (Plymouth) - 01752 256262

Also try this link to Yellow Pages:

Yell.com

:D
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Postby zetec_si on Thu Feb 20, 2003 1:25 am

Cheers Project, will check it out. :)
Mk3.5 1.6 Si -> 2.0 Zetec Conversion - SOLD :(
MKIV Supra, S362 Billet Single Turbo (624.7HP/520ftlb) - http://www.youtube.com/user/MrG33kman
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Postby Richards MGX on Thu Feb 20, 2003 10:54 am

Should squeeze out a few more horses...like mine.

If you're definately gonna get a pbv, do get it first and do it all the same time.. :)
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