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My Budget 300bhp St185

Sat Mar 29, 2008 8:15 pm

Mods as per signature pic and below

So total expense for 300bhp. & 290ft-lb @ .9bar (a lot of ebay bargains)

No det and good A/f ratio...

£10 MHG ebay
£20 FMIC ebay (was given pipes as a thankyou for help)
£30 ProfecB boost controller ebay
£350 Exhaust
£100 Downpipe
£700 ish Turbo ( turbo Technics Hybrid / modified single exit wastegate )
£50 Air Filter
£10 BOV ebay

Total £1270 so £12.7 per bhp increase im happy with that

Torque falls away as im outside the range of the turbo need to be running 1bar at least so more hp to come once fcd is in...


Pipe from turbo over heatshield has now been lagged since this photo.


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Sat Mar 29, 2008 8:47 pm

good stuff MrDB. a budget faff beater

s148 ftw! can you share your afr print out please .


Sat Mar 29, 2008 9:21 pm

many thanks unfortunatly i didnt get a copy of af ratio just saw it on screen. Dyno operator was impressed and said combination worked well just a tad rich and seemed to have scope for more...

Mon Mar 31, 2008 5:35 am

Thats pretty impressive. Nice set up.

Mon Mar 31, 2008 9:37 am

Im fitting my FCD and upping to 1bar maybe 1.1 if all is ok and then getting another RR done will get printouts done of Boost / af etc this time..

I have my wedding this week so maybe a few weeks before i get it redone..

Who says 300bhp is hard to get on a 185! :)

Mon Mar 31, 2008 10:13 am

Congrats on your wedding.

Do you remeber what AF you had? What is the spool like(at what rpm do you see 0.9bar)?

That is a real bang for buck setup. :D

Did you up the base pressure?

According to this site(http://memweb.newsguy.com/~gtfour/fuelreqr.htm)
If everything is stock, you have fuel for about 260 HP(90%duty). I don't know the A/F this guy used, but his car is still running. You running 300 hp on 440's and stock FP can mean leaning out and BOOM. So be carefull.

Mon Mar 31, 2008 10:44 am

Many thanks on wedding!

Pressure is std whatever that is ( it varys ) and was still a little rich but agree its prob at about 100% duty.

To be honest i think Fuel pressure plays a big part in most setups on std injectors and fpr on what you can get power wise. The variation in pressure on a std regulator ive been told is significant so some are low and some are high. 440's at the right pressure act like 480's so you have some scope. When i took the head of not long ago there was no sign of det or running lean.

I only run at this a few times so not always at max boost.
Injectors run 100% duty almost at anything above stock boost as long as fuel is there it sould be ok and i dont rag it everywhere only occasionally.

Spool on this turbo when on std topmount was only slightly higher than my std ct26 and with front mount is still amazingly good. From memory .9bar about 3.5-4k and usable boost about 3k Where torque peeks on graph is around 4200rpm

One thing i do know is that formulars are only best fit i know of many a 300+bhp car running 440's that are perfectly fine but that site still states not enough fuel... Only real way is RR with af ratio....

they give you a good estimate on requirement but its not exact science. Does not take into accunt atomisation etc only the theory...
Last edited by MrDB on Tue Jul 01, 2008 9:41 am, edited 1 time in total.

Mon Mar 31, 2008 8:46 pm

and people think ct series turbos arent good for anything. good stuff! any specs on the turbo?
oh and congrats on your marriage!

Wed Apr 02, 2008 9:38 pm

To be honest i havnt got the specs as i was recommended it from a fellow gt4 owner ##BETSY## ( hes running one on a powerfc and 350bhp ). Its model num is s148 available from Turbo Technics. Has single wastegate so no boost creep good for 1.6bar and 380bhp apparently which i think is possible. Judging from mine.


also do a stage 2 of this not sure on performance of this as i dont know anyone who has had it??

Tue Jul 01, 2008 2:20 am

So does this turbo bolt right up with stock lines?

Any issues with it thus far?

Impressive numbers!

Tue Jul 01, 2008 9:38 am

Yes fits 100% as stock! No issues so far. Still eating scoobies! ;)

1bar is nice hopefully upgrading to a bigger cosworth intercooler as now summer is hear intake temps are creaping up ( nothing serious ).

Also considering a link ecu if money and wife permits lol

Std clutch still holding also!

Tue Jul 01, 2008 1:06 pm

This is great news specially for us low budget guys.. I talked to RickyB about dyno tuning my car which has way more stuff than yours, and he told me that he doubt ill see 300HP with stock cams. This definitely got my hopes up.. :D

congrats on that great numbers..

Tue Jul 01, 2008 1:30 pm

is that all wheel horspower?

Tue Jul 01, 2008 1:41 pm

@ the fly hp mate!

"I talked to RickyB about dyno tuning my car which has way more stuff than yours, and he told me that he doubt ill see 300HP with stock cams."

cams actually will make only a small difference and then only mainly exhaust cam. Turbos respond less to porting/cams than NA cars.

300hp is cheapishly possible on a healthy engine.

Add ecu and injectors to my setup and 1.2-4bar should see 350 easily...

Tue Jul 01, 2008 2:17 pm

What kind of AFR are you seeing with this turbo?

No aftermarket fuel pressure regulator or anything right?
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