reaching 180-200bhp

[Junglist]

Hi all
Im aiming to get to around 180 bhp put of my 5 , just got a few questions.

Will i need a different cam / what is the max you can get out of the oe one.

Rejetting the carb ,do i have to drill out the jets or can i buy them allready to the req size , what sizes would i be needing.

what boost psi should i be aiming at .

any thing else needed / are liners pistons etc nessersary, so called uprated fuel pump ?


i have, fmic / sidey / t2/25 / borris down pipe / cone filter / aem wideband.
oe carb and cam

[BluntyR5GTT]

whats the spec of your t25/t2 ? also do you have a 360 bearing in there ?

id look at changing the rear end on the turbo to a .49 t25 and a change of cam is worth doing either 270 or 285, i had a 270 on my car and it worked well even with a little t2 turbo.

boost wise id say 18-20psi should get you to what you want depending on turbo and cam choice

[raider_gtt]

Hi all
Im aiming to get to around 180 bhp put of my 5 , just got a few questions.

Will i need a different cam / what is the max you can get out of the oe one.

Rejetting the carb ,do i have to drill out the jets or can i buy them allready to the req size , what sizes would i be needing.

what boost psi should i be aiming at .

any thing else needed / are liners pistons etc nessersary, so called uprated fuel pump ?


i have, fmic / sidey / t2/25 / borris down pipe / cone filter / aem wideband.
oe carb and cam


i can help ya with a cam cheap if you need one i have one on here to members piper bp 270 £112 posted within the uk or i have other one that has no markings to tell you its (make) that im selling cheap on ebay due to this only thats new as well
but i can tell you its deffnutly a fast road cam and matchs my kent cam one i have just sold to a member on here i have for sale piper springs and piper cam pulley as well
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=120690003571&ssPageName=STRK:MESELX:IT

[JRP]

Okie dokie.

Get a Afr gauge so you can see whats going on with your fueling etc..

Make sure the basic componants of the engine are working and well maintained.

Adjust your fueling to suit the boost pressure, AFR wideband what ever you call it will be usefull.

make sure the cars coolant is up to the poke.

dependant what you want the car for depends on cam and turbo choice.

285 and t25? after you have all basics spot on :)

piper 300 for sale here too if you want it lol...

Hope that was helpful

[Logg]

Stock engine is good for 200bhp. it's all about making sure the engine is in good condition, charge temps are low and fueling is safe.

I should hope you present turbo would see 170bhp maybe more if you want 200bhp a bigger turbo is needed a full T25 or a T28.

[Junglist]

My engine seems good never had a problem with it.
The tappets need doing and i get a bit of water in the catch tank.
As for the internals and their condition ive no idea.
Head gasket not been changed in 10 years but seems ok.

just been on rolling road 145.8bhp @14psi

Turbo is a T25/T2 with .47 rear housing.

Coolant changed last year.

Oil and filter changed twice a year.

What afr`s should i be looking for for best results at 18psi with an oe cam.
as a guide what jets in the carb do i need to change and to what size.
i understand every car is different but i need to start somewhere.

is a performance cam absolutely nessersary for 180bhp.
i would go for a 285 but wanna stay away from fitting one (as its more than likely gonna be a pain in the ricka) and dont have the tools or experiance.

When do i need to check the afr , idle , wot , ??

Thanks.

[Markey Mark (BD)]

I'd say on the turbo you have now 200bhp is going to be slight push, i'd opt for something alittle bigger.

A change of cam isn't normally needed, 200bhp can be obtained with a standard cam in place whats more important is the carb is set up right for the boost you want to run.

Doesn't matter what engine spec, turbo spec or boost you run you should always aim for around the 12.1 AFR on WOT, aiming for that will get you in the right area.

As for carb spec is really depends on how your engine performs and fuel system is doing, as a very rough guide i'd say 25mm venturi, 1.2mm main jet, 1.1-1mm ac jet, 1.3 2nd stage and a 2mm needle valve. Thats a very rough guide though, you may find out your carb needs smaller or larger jets depending on how it performs.

[shaggy]

Dan get your self a carb refurb kit from the club shop
http://www.rtoc.org/shop/index.php?main_page=product_info&cPath=23&products_id=45

And then have a good read of this in the Articales
http://www.rtoc.org/boards/showthread.php?t=4743

This ones for setting up your boost
http://www.rtoc.org/boards/showthread.php?t=460

http://www.rtoc.org/boards/showthread.php?t=15054

You can get smaller jets from ktec racing for the ac jet

[Junglist]

Thanks guys im gonna get on this , and get at 18psi :)

[Maka]

piper 285
20psi
T25 / T28
front mount intercooler
1.20 main jet
1.4 secondary enrichment


tried and tested method by a lot on here and there all pulling near 200 horses and 13 seconds easy at that spec!

dont bother with head mods or any other silly manifold gimicks.
slap a side exit on it and let the bitch roar!

[Junglist]

i dont think ill be changing the turbo anytime soon as its new.
ill head for as much as i can id like to see 180 if poss.
ill get the fueling sorted get boost whacked up then get on the rollers again see where im at and go from there. :)

[Jimmy_GTT]

I'm really interested about your results. As I'm running on the same turbo but recently changed to EFI and it hasn't been fully mapped yet.

[LYNCHSTAR]

piper 285
20psi
T25 / T28
front mount intercooler
1.20 main jet
1.4 secondary enrichment


tried and tested method by a lot on here and there all pulling near 200 horses and 13 seconds easy at that spec!

dont bother with head mods or any other silly manifold gimicks.
slap a side exit on it and let the bitch roar!

what a/c jet would you use.

[Junglist]

I'm really interested about your results. As I'm running on the same turbo but recently changed to EFI and it hasn't been fully mapped yet.

i wont be doing it this month as the mrs says i cant spend any money on it :( :laugh: for a while. :disagree:.

ive just been on the rollers at 14 psi and it made 145.8 bhp.

[Maka]

what a/c jet would you use.


off the top of my head i think it was 1mm. 0.9mm was far to rich.
i think!

the needle jet was 2mm, they are available on german ebay, as i believe solex stuck a carb on a landrover which used a 2mm needle jet.

all you need then is a set of small drill bits 1, 1.1, 1.2, 1.4, and an afr gauge or someone with an afr gauge to watch your afrs afte doing the drilling

[Junglist]

current afr readings;
idle 13.9 (mixture screw fully in).
wot 12.5 - 13.0 (thats foot down goes to this for a sec then rises).
cruising is all over the place from 14.0 - 18.0 very jumpy .

gonna get the carb off and rejet soon as i can.

[Junglist]

I'd say on the turbo you have now 200bhp is going to be slight push, i'd opt for something alittle bigger.

A change of cam isn't normally needed, 200bhp can be obtained with a standard cam in place whats more important is the carb is set up right for the boost you want to run.

Doesn't matter what engine spec, turbo spec or boost you run you should always aim for around the 12.1 AFR on WOT, aiming for that will get you in the right area.

As for carb spec is really depends on how your engine performs and fuel system is doing, as a very rough guide i'd say 25mm venturi, 1.2mm main jet, 1.1-1mm ac jet, 1.3 2nd stage and a 2mm needle valve. Thats a very rough guide though, you may find out your carb needs smaller or larger jets depending on how it performs.

is your guide for 180hp m8.

[TNT ANDY]

I'd say on the turbo you have now 200bhp is going to be slight push, i'd opt for something alittle bigger.

A change of cam isn't normally needed, 200bhp can be obtained with a standard cam in place whats more important is the carb is set up right for the boost you want to run.

Doesn't matter what engine spec, turbo spec or boost you run you should always aim for around the 12.1 AFR on WOT, aiming for that will get you in the right area.

As for carb spec is really depends on how your engine performs and fuel system is doing, as a very rough guide i'd say 25mm venturi, 1.2mm main jet, 1.1-1mm ac jet, 1.3 2nd stage and a 2mm needle valve. Thats a very rough guide though, you may find out your carb needs smaller or larger jets depending on how it performs.

is your guide for 180hp m8.

I'd say use the above guide as a starting point to achieve as much as you can for the given boost. Try the above jets at 10 psi and keep your eye on WOT's and increase boost pressure till you max at 12.1. @ say 16-20psi you really need to start looking at charge temps also.

[gttjames]

200bhp is do able on standard internalls and a t25/t2 - but thatl be on max of turbo

Look at my spec, made 187 at 17psi - standard engine with front mount and t25/t2

TNT ANDY whats the best way to measure charge temps with 5's then? when mines back and running im going to be raising boost so could do with knowing, cheers