I am posting this info seperate from the "other thread" because I am now into mods that are beyond a "stage one" bolt on kit. The new mods I am doing, I am also doing as bolt on and non invasive reversable changes. These include: 1) fuel distributor sent to Fletch (cis flowtech) for rebuilding and 25% enhancement 2) Crane fireball CDI 2 channel ignition with boost proportionate retard (set at 1.25 deg retard per lb of boost) 3) increase system pressure to 95 psi, and control pressure to 70psi 4) I guess we could call the 044 (400 lph) fuel pump previously installed as stage 2 (it was overkill for the stock fd) 4) 2" diam restrictor pre S/C (increased from 1 1/2" last dyno) I have almost got it tuned properly as of todays dyno (310+ rwhp!!!) but I can see a need for just a little more tweeking. I think I will need to pull the restriction venturi down a bit to limit high rpm boost (its 11+ now) and perhaps tweek the WUR boost enrichment by either adjusting pressures, or limiting the "early" control pressure decrease mechanically. I am running overly rich from 5200-6400 rpm, and its flattening hp and torque a little. Below are run graphs from the dynojet (sae) and my on board wide band datlogger (both graphs are from the same dyno run today). The car is very drivable throughout the rpm range, and very very fast, I am confident with a tiny bit more tweeking I will get it to fuel smoothly to redline+ with a good margin of saftey (10.5 ?) I plan to tune for max torque at or around 7000, with boost limited to 10psi at 7800rpm. I'm super happy...(365-375 bhp 308 by my calcs!) can't wait for Willow Springs (video to follow). (note to moderators. Lets not merge this with the "S/C kit for 308,328, Mondial" thread please. Carl and I plan to complete the cosmetic and installation manual aspects of the "stage 1 bolt on kit" in the next few weeks.) -Luigi Image Unavailable, Please Login Image Unavailable, Please Login
Great project I salute you and it's also nice to see someone who realize's that tuning for 'max torque' is more important performance wise than tuning for max HP for a street driven car.
I know I have said this before, but I really think I have it dialed in now. I fabbed up a 1.75" diam conical intake restrictor and installed into the intake tube just past the K&N filter. In a dream epiphany last night, I thought " what if adjusting the WUR to a very high control pressure setting would cause it to enrich a little later due to progressively increasing resistance from a more compressed internal spring". I was right !! with my system pressure set to 95psi and the adjustable WUR control pressure set to 82+psi, the enrichment curve flattens way out. This change compiled with the 1.75" intake restrictor limiting the air flow and total boost @ redline to under 10psi works awesome. Cruising A/F runs at a tidy 14.5 +/-, and the boost still comes in pretty early ( its @ 4psi by 4000rpm). The A/F enriches to 10.5 +/- in range where we drive these cars 4500-7000rpm, and @ 7800 it is still well under 11:1. I am now in a position to go back to the dyno, and actually "dynotune" for torque and safe redline A/F, and perhaps pull the rich dip up a little more. Neat. below is a dataloged 3rd gear WOT road pull from today. Image Unavailable, Please Login
A few more tweaks before track days yeilded an even flatter A/F response. check out this track day thread http://www.ferrarichat.com/forum/showthread.php?t=173453
Lets just say the Elv's are working furiously in the "toy shop" to bring me a 320+rwhp Christmas present.
Well, the elves had a little R&D to do over the holidays........ But along with the production stage one supercharger kit being returned to me in finished form, I also got some tuning option parts for the stage 2 mods I have been working on. I'll be working on both stage one and stage two options with dyno runs next week. (I'm considering a stage 3 water injection addition (removeing the intake restrictor venturi), but that depends on how much boost we can make without over clocking the SC impeller drive) we shall see. I'm still very sure I can make 320rwhp @ 8-9 psi, 7500rpm. -Luigi
I think I'm about there now (or will be soon), and will be looking to do the clutch next. I think history has proven 400hp is the ceiling for a stock clutch in great condition, and mine is not new. We shall see, next week. Reccomendations ? Cost?
SC is back on the car. I have a few options for dyno tuning this week (once I iron out a small tracking adjuster glitch). A few more choices now of pulley diameter, intake diam/restriction, boost enrichment and ignition retard @ boost should yield a field of options for max HP and peak torque @ a given RPM. Should be interesting. I'll probably run a high boost @ redline high HP dyno, and then clock it back to max torque @ around 6800-7000 rpm with a good air fuel safety margin @ 7800 redline. Once that is established, I can look at opening up the intake and pushing the boost up to the RaptorV design limit of 10psi (perhaps adding water injection and bumping the ignition retard to eliminate any detonation). It all seems very do-able with the tools I now have.
I've got a 308 flywheel modified to accept a tilton 7.25" pot style mulit-disc clutch along with an adapter that fits the throw-out bearing. I had a triple disc carbon-carbon set-up in it that just laughed at 540 hp, but a 2 or 3 dics organic would work too and cost a lot less money. If you've got a good stock flywheel, I think I know someone who need one.
Um,...I pulled a 330 rwhp dyno today @ 7800 (do the drivetrain loss math however you want, still HUGE...for a CIS FI system 380 to 400+ bhp) dyno runfile and LM-1 logs later on .
Dyno graph and LM-1 log below. Not exactly perfect, but I wanted to see HP and torque potential. The flattening of the hp and torque right at about 6000 is probably due to excessive ignition retard, as it is boost relative and set at about 1.5 deg per lb of boost. 12 psi is too much boost for both the current FI and the RaptorV compressor, and no intercooler. I think this configuration is limited to a safe redline of about 7000 rpm I have some other slightly dialed back config with dyno graphs. All still in the 300 rwhp range with great A/F to 7800 rpm. Image Unavailable, Please Login Image Unavailable, Please Login
