98vtec

yea so, i am going boost. I picked up a JRSC about a month ago from a friend and im looking at how feasible this project is going to be. My compression is right around 12.2:1. I am considering water injection and a water cooled inline aftercooler. The fuel setup would be pretty simple since i want to use the new bosch 1000cc injectors. I would like to be able to run this on two maps but both being reliable. 93 octance vs. e85 vs. q16.

I would like to know if there is anyone around that has a setup kind of like this and could give me pointers to things to look out for. Obviously hotter intake charges are going to be a worry and excessive timing retard (from where i am now...33* total at 7500rpm). I was considering doing some DIY combustion chamber work to remove material and effectively reduce the compression but im really not sure how much that little amount is really going to help.

thanks

Tom-Guy

You want to lower CR, or just run racegas/E85 and skip the pump.

You can make power on pump with some okay reliability, but it requires retarding the timing to the point the exhaust valves are pretty hot under load in the low rpms (below 3-3500 rpms). It may be stable for a long time, but eventually it will catch up to you. Water injection is all well and good, but it's a band-aid since the setup wasn't "designed" for a blower.

Engines with too much CR for their fuel can be made more tractable with a cam that has some overlap in the lowcam region (Skank9 Pro1s, etc) but I dunno how the blower will like that.

98vtec

i have the 5, 7, and 9 lbs pulley and I have a friend that can machine me pretty much any pulley size i wanted. The problem with e85 is that we only have one pump here in tallahassee and its about 5 miles from my house and supposedly we have a station somewhere nearby my house that has pump 112 unleaded but i havent found it yet.

The other problem with the compression is that i am already running a .051" headgasket and i really dont want to run a thicker one than that. I had talked to mike belben awhile back about running too thick of a gasket and running into regions of hot spots and thats definitely no good. My original compression is around 13.2:1. I have a head on the way to me from Steve aka CCcylinderheads but im really reluctant to run that with the charger as i really dont want it to get messed up in the event something bad happens so thats why i wanted to use my stock head and modify it a little bit to help out with flow and a slight compression drop.

As for the cams, i am still doing my research on that and being the roots JRSC is going to have more NA characteristics (in a nutshell) I could get away with running the higher duration cams but thats just going to take trial and error i think to find the right set to keep it efficient in all portions of the map without having to sacrifice too much ignition retard.

would you definitely say that an EGT gauge would be a must with this setup? Its very rare that i beat on my motor and i maintain it very well. I'm so much much worried about the higher RPM ignition as i am the transition from low to high cam (currently at 4100). I had problems on the dyno even in its current state with it detonating on the transfer but a drop in timing fixed that, however the intake resonance bump i am getting on my graph is causing problems in fueling.


That bump at 4000 is the intake resonance + vtec. Right at the crossover i have a lean spike (which aided with the detonation at a higher ignition advancement) and a sudden rich dip and then smooths out. I have been trying to tune this out on the street but i cant find it at all. This new setup may require me to run a shorter intake so the resonance bump will be higher in the rpm when the engine is under as much "load" if you get what i mean.

the other thing i was considering is a hydrogen cell. I have been reading about it on the ectune forum on chris delgados setup but i am unsure as to how much that would actually benefit me as well.

I know the intake temperatures and cylinder pressures are going to be a big problem but if i can keep the temps down to a relatively stable level then i believe i could keep this setup pretty reliable.