T4 owners or people in the know

I may be fitting a T4 to my 3dr which is currently running a T34 .48, 803's, MSD evo chip, 500 cooler & 2k rebuilt standard 205 engine.

By fitting greys and the T4 and another set-up at MSD would the whole package work or does it really need to be low comp??

Cams can be fitted and head work to grp A spec isn't a problem either.

Any info would be great

 

your spec will be fine,although i ran greys before and maxed them quiet easily,get siemens same price

 

Great Col i think MSD sell siemens.

Will the head gasket be fine at this spec it's a YB Grp A item.

 

You'll be fine mate, MSD done the same set up on my car

 

Excellent Gary

 

id say so mate,i wouldnt do a head gasket unless it went

my old saph was stage 3 +nos and on standard gasket and never went

 

isnt low comp old school know?

but yeah, def get siemens blacks, get them from the US, half the price

http://www.fiveomotorsport.com/

 

matt lewis does siemens at great prices,thats where i bought mine

msd will see you alright aswell

mind and rewire your fuel pump though as stu wont run your car up if its not getting 12-14v at the pump

 

mine is low comp and works well but a bit shit at low revs due to this and the cams

 

yeah not knocking it; just thought that low comp engines drive really bad off boost?

i was under the impression the latest way to get more power/torque was high comp? i'm probably wrong tho

 

think most tuners advise higher comp now

 

i think your need big head ports to make good power you might get stuck at t38 power instead of t4 i might be wrong.

 

400bhp on standard head id say

 

And me........

 

i'm led to believe 420 is about the limit of a standard head.

 

on standard comp i would whack the siemens on and keep standard cams and source a t34 .55 exhaust best of both worlds power and minimal lag..

 

i had this exact spec on mine (until i sold it), made for a very quick road car

go for the siemens and get the 83lb ones to future proof yourself, they are the same price

 

brilliant spec for road and having a giggle!

 

From the site listed above this is the info given for the 83lb is it correct

2.8 Ohms Low Impedance
83lbs/hr - 865cc/min
P/N 3105
Siemens Deka

Or

12.0 Ohms High Impedance
55lbs/hr - 575cc/min
P/N 3172
Siemens Deka

 

The heads limit is around 420bhp

Mines still on standard cams

And I think im using 83lbs Siemans

 

You can make more power than 420 on a std head, the point is though you will reach a point where gains will be getting smaller and smaller for more more and more boost.
I always balance cost versus performance gain, no pint in a modded £1K head for extra 20bhp for example if a slight boost tweak will do it.
Always keep the cr as high as you can get away with, if injectors are near limit rail pressure can be increased, some cars(porsche etc) are 5 bar as std, with vac on, so 5.7/8 with vac off.
Proper mapping will be mind blowing driveability wise, and extra advance lower down will lose a lot of the lag, not all obviously.
tabetha

 

How much more can you make on a standard head then?

 

i think they come in 3 forms, 55lbs, 72lbs or 83lbs, i'm pretty sure they are all the same price - you will need low impedance 2.8ohms

i had the 55lbs format and the part number was Siemens Deka 3102.

i can't get onto that webiste at work for some reason, but i'm 99.9% confident these are the ones you need

2.8 Ohms Low Impedance
83lbs/hr - 865cc/min
P/N 3105
Siemens Deka