Injector size confusion

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mikerj
MS/Extra Newbie
Posts: 2
Joined: Mon Aug 08, 2005 1:48 pm

Injector size confusion

Post by mikerj »

I'm adapting a set of GSXR750 TB's to fit on my Vauxhall (GM) 20XE engine (4 cylinder 2.0L 16v with sequential port injection). Stock power is 155bhp, and the stock injectors are Bosch part 0-280-150-744 rated at 214.4cc/min (20.4 lb/hour).

Now, by my reckoning these injectors already seem to be pretty marginal in terms of flow for stock power, certainly I'm not convinced they would deliver 155bhp with 85% duration.

However, a respected Vauxhall tuning company in the UK (SBD) offer a throttle body conversion which gives up to 208bhp, and uses the stock injectors! I guess they run a higher fuel pressure (stock 36.25psi), but it would have to be a considerable hike to get any saftey margin.

I'm hoping to get ~170-180bhp, and I'm wondering if I can either keep the stock injectors, or use the GSRX750 ones which according to a thread on here are rated at 240cc/min, or wether I should err on the side of caution and get larger injectors?
VTEC_EATER_16v
MS/Extra Newbie
Posts: 12
Joined: Sat Jan 14, 2006 7:25 pm

Post by VTEC_EATER_16v »

I'd grab a set of Ford REDTOPS from summitracing.com They're $200 for 8 or $160 for 4. They flow 30lbs.
milesinfront
Master MS/Extra'er
Posts: 393
Joined: Fri Aug 20, 2004 4:25 pm
Location: Australia
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Post by milesinfront »

Why not use what you have until you KNOW they are not big enough....

I'm using itb's and injectors from a Honda CBR954 on my Dolomite Sprint. I am currently making around 150-160hp at only 50% DC...
-1988 325is BMW M52B28 - > MS2 Extra n Spark (60-2 Wheel, Wasted COP, Single VANOS)
-2004 Opel Corsa C / Holden Barina Z18XE - > MS1 Extra n Spark (60-2 Wheel, Wasted COP)
-1976 Triumph Dolomite Sprint Race Car -> MS1 n 'EDIS'd
-1984 C1 2.3 Alpina -> MS2 Extra n Spark (60-2 Wheel)
mikerj
MS/Extra Newbie
Posts: 2
Joined: Mon Aug 08, 2005 1:48 pm

Post by mikerj »

rickmilesracing wrote:Why not use what you have until you KNOW they are not big enough....

I'm using itb's and injectors from a Honda CBR954 on my Dolomite Sprint. I am currently making around 150-160hp at only 50% DC...
Ok, thanks, that sounds like a great project. Out of interest, what kind of fuel pressure are you running?
milesinfront
Master MS/Extra'er
Posts: 393
Joined: Fri Aug 20, 2004 4:25 pm
Location: Australia
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Post by milesinfront »

dunno.... using the stock Honda FPR... 40-50psi I guess...
-1988 325is BMW M52B28 - > MS2 Extra n Spark (60-2 Wheel, Wasted COP, Single VANOS)
-2004 Opel Corsa C / Holden Barina Z18XE - > MS1 Extra n Spark (60-2 Wheel, Wasted COP)
-1976 Triumph Dolomite Sprint Race Car -> MS1 n 'EDIS'd
-1984 C1 2.3 Alpina -> MS2 Extra n Spark (60-2 Wheel)
screamer69
Experienced MS/Extra'er
Posts: 323
Joined: Mon Jul 25, 2005 3:20 pm
Location: peterborough ----uk------

Post by screamer69 »

yer standard xe`s run @2.5 bar (creams) all they do is up the fuel pressure to 3bar and away u go ive run a set of xe`s running on a custom 8v turbo running 10psi boost and i never had a problem with them ! thats estermated at 200bhp !
2.0 8v turbo 10.7 standing 1/4@136mph on m/s fastest mk2 astra 8vt in europe !!!
2.0 turbo tigra 10.1 standing 1/4 @ 145 mph with problems :( havent turned the boost up yet
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