LBSZ28BLOWN

Hello,
New to the MSG board.
I Have a 92 Z28 conv.TPI 305 with a sn2000 Paxton. stock 19lb injectors, fuel pressure set at 59psi, gose to 63psi at 8psi of boost.
I believe I need to upgrade to 24lb injectors
and have my prom recalibrated.
Which Injectors should I go with
BOSH or MSD.
Reliability and quality are most important.

Thanks, Your advice is appreciated



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Louis S.
Convertable
92 Z28 305tpi Paxton

Guido

I went with SVO injectors. They are a bosch injector I believe and are pretty cheap if you buy them through summit or jegs.

Are you sure a #24 is right for you? Thats sounds pretty big. You would defenitley need some PROM work so that it would not run so rich on you.

Good luck


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-86 IROC
Vortech stuffed EFI 406 in progress
-=ICON Motorsports=-

LBSZ28BLOWN

Are you sure a #24 is right for you? Thats sounds pretty big. You would defenitley need some PROM work so that it would not run so rich on you.

Good luck


[/B][/QUOTE]

WHAT INJECTORS SHOULD I RUN?
My spec's:
305 auto 2025 stall
Paxton 8psi w/water injection
52mm T/B
AS&M Large tube runners
ported & polished upper Intake
ported & polished lower Intake
gasket matched & checked w/a borescope for perfect fit
1.6 roller rockers
slp headers
Gale banks 3in exhaust
random 3in cat
19# injectors fuel pressure set at 59psi
My o2 runs at .780 to .813 at power
Timing is at 29deg at power
MY Latest Dyno #'s:
323.7hp at wheels
365 tq at wheels

Thanks for the help
Louis

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Louis S.
Convertable
92 Z28 305tpi Paxton

Willie

iTrader: (1)

Louis,

I run a setup very similar to yours (check out the link in my signature). I run 50 psig (at no vacuum) and about 55 psig at 6 psig boost. My O2 readings are approximately 950mV with injector pulse width up to 16mS. And this is with stock 19# injectors. It sounds like your pulse width is too narrow. Do you know what it is?

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Willie

Supercharged 1987 305 IROC-Z, Daily-Driver, Emissions-Legal.
12.57 @ 111 mph.
12.04 @ 114 mph (50-hp nitrous).
http://www.ozemail.com/au/jca69/mods/williesz/willie.html

1987 "20th Anniversary Commemorative Edition" Z28 Convertible -- Super Chevy Show Class Winner, 1998.

LBSZ28BLOWN

Willie,
I looked at my last runs and my pulse with is running at 12.4ms.
Who did your prom calibrations?, and was it done on a dyno or just by a list of your mods.
By the way NICE car.
Hopefuly soon I will have a site with my car and pic's

Louis

Willie

iTrader: (1)

Louis,

My prom is a TPIS Level V.

Although 12.4mS is good for a normally aspirated engine, it is not enough for the mods we have. This is the pulse width I record without my supercharger and the resulting O2 sensor readings are in the 900mV range. When I run with the blower, the pulse width increases to 16mS, which sustains my 900mV+.

Based on my results, I would have to conclude that you do not need larger injectors, but a properly tuned prom.

Willie

[This message has been edited by Willie (edited October 03, 2000).]

gta324

I talked to a shop www.musclecars.se they have built a 383 with trickflow heads 1.6 RR and a 9 psi ATI and they have the stock prom and stock injectors.

I leaving my car at this shop next year...

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GTA -89:Free flow muffler,dual 3" HF cats, Edelbrock headers, Vette heads, 1.52 RR 7/16, ZZ-9 cam, Big Mouth, AS&M LTB, ported plenum, 52 TB, MSD 6AL, TPIS level V prom, Mod .MAF, Superior shift-kit and some minor mods. and more to come!
http://www.itv.se/tacs/members_cars/m279/m279.html (Swedish Trans Am Club)