BC

www.msefi.com

Hacker - did Todd buy the blocks to sleeve?

FlyingDog

Your published CR is 8.5:1 but knowing how others are lower, I wouldn't be surprised if it's really 8:1. John Kuhn's 9:1 L-jet was really 8.1:1, several 10:1 S4s have been measured at 9.3-9.4:1. One problem with using L-jet is the injectors. The are barbed fuel supply, low impedance, long tip injectors. There aren't many options to replace them when you need more fuel, and not all EFI systems will drive low impedance injectors without converters. If you want to use stock fuel rails, find an S3 or S4 fuel setup. You can use the standard (cheap!) Ford O-ring fuel supply high impedance injectors. You could either modify your intake runners, or buy L-jet or 16V LH-jet runners to go with them.

hacker-pschorr

I'm not sure how many engines he has lying around anymore. Last time I was there he had a block all prepped for the sleeve’s he made, and picked up a basket case of an S4 as a donor car. I’m sure there will be a 7.1 liter SC S4 running around Wisconsin in no time.

BC

I need to find out the $ on a prepped short block from him. Or at least the block itself with readied pistons.

tammons

You should upgrade to a tec III with the new feedback loop.

Call fred. He can explain the differences.

tammons

Once you drive your car at 8psi, I think you will find that is enough. I ran mine at 12 psi for a couple of days, but i did not have froged pistons so I backed off.

Its fast enough at 8 but 12 is sick.

I ran into some guys down here that had built a S4 with a bored out custom motor at around 20-24 psi and they were making over 900 hp. Could not keep the drivetrain together though.

tammons

Imeant forged pistons not frog pistons.

Lance J

i'd be happy with 8psi but to have 12psi under you thumb is a great feeling.
so let me get this get all the 81 l-jet parts but not the fuel rails
get those from a 85 lh-jet. that way i can use ford injectors

Lance J

as flying dog put it use the all Lh-jet parts but have the option of using a 16v Lh-jet or l-jet runners

Barry Johnson

Ok, here are a couple links to converting (starting from L-junk) to the GM ecu setup.
First one is the conversion on a 928, 2nd one is more about using it in a boosted setup.

conversion to GM ecu

Modifying the GM ecu

tammons

Interesting

JEC_31

Holy cow, that's quite an interesting little modification you've got there. Nice belt-snail, too.

Lance J

what about upgraded injectors barry. Ohh i pick up a t61 turbo today hehehe.... its the one mark uses on his turbo beast.

FlyingDog

Get the whole fuel rail, regulator, damper, crossover, return system from the 32V. You'll have one less regulator and return to worry about.

If you don't mind running high fuel pressures, you could run the stock L-jet or 16V LH-jet fuel setup. The problem is that you have basicly no options for higher flow injectors if you want to run normal fuel pressures. Also, the 16V LH-jet S2 injectors aren't plentiful used or cheap new if you get a bad one.

BC

I've been thinking about this Matt. What about drilling the holes out in the LH 16V intakes to accept the later injectors? Drilling it out a bit to sink it lower towards the valve?