romandian

its the airtex aw5081, wp9189 whichever is their part number.

schpenxel

I've read about some people having alignment issues with non-OEM water pumps, though I don't know if it's really a problem or not

RpeterK

Thanks for that input. It could be an issue. I did research this and I did find some errors of up to .02 depending on supplier. This was a few years back and would definitely cause alignment issues. Unfortunately I would imagine most aftermarket vendors change their suppliers more so then Gm. I addressed this in one of the emails I sent Roman last night. I really have zero history on his car so its like shooting in the dark.

Thank you
bob

romandian

the car survived the weekend without issues. using a 3 mm spacer on the blowershaft the belt stayed in place. i found another 0.1 bars of boost, i have 0.7 bars @6000 and 0.8 bars 6400 now. makes sence, the belt was slipping when jumping. im a little sursrised by 11.5 lbs of boost, wasnt the kit supposed to make around 8 lbs?

well, im done with engine tuning for now. i have it at 11.5 afr and 15° timing. no traction problems in second gear with the r888s. i had it at 17°, but didnt notice any difference. ill play with the transmission a little and start looking into the suspension.

concerning the spacer, geometry of belt and pulleys suggest i should go with a 4 mm spacer. i made it already, but for the time being im reluctant to change a setup that works. ill be watching the belt for wear. i also have no clue on the hitory of the car, so it may very well be that the balancer is different from stock, although it didnt make any problems before the blower install.

schpenxel

That is good to hear! How much smaller is that spacer from the original? At least all is working.. I'm surprised by ~12psi boost also but I guess it is what it is.

romandian

original spacer was 7 mm.

is anybody out there with a stock motor running no restrictor on the kit? how much boost do you get?

the only thing bothering me now is fuel delivery. im over 90% on the injectors and fuel pressure drops to 48 psi from 66 at idle. that lingenfeltner pump is just not enough, as i had suspected from the beginning. i will check the voltage at the pump and maybe rewire it, but the weird thing is that fuel pressure drops consistently with ibpw from idle. i would have thought there would be a point up to which pump keeps up with demand. so maybe the issue is somewhere else?

sanity check:

48 psi - 11.5 psi = 36.5 psi
60 lbs @ 58 psi
60 lbs/root(58/36.5) = 47.6 lbs
47.6 lbs x 0.9 x 8 = 343 lbs
343 lbs/0.6 (bsfc) = 571 hp

seems o.k.

pump is rated at 186 lph @12v and 58 psi. 186 x 0.76/0.45 = 314 lbs/h. so i need to get more than 12v to the pump. at 13.5v it should flow 403 lbs/h.

schpenxel

What year is your car? I thought the earlier C5's had a vacuum referenced fuel pressure regulator at the rail?

romandian

its a 99. unfortunately it has the stupid returnless system including the even more stupid integrated filter/regulator. the more i think about it the more i suspect the regulator being the problem.

neutron82

glad to see you are making some progress, once you get these issues sorted out you will start to have a lot more fun with the car... before I swapped their bracket/tensioner out I was making 12psi with no restrictor... I am using a procharger headunit but still 12psi nonetheless... when I first installed it I left the restrictor plate in and took it out to see what the difference was like and after having it tuned for no plate it was easy to make the decision to leave it out... after swapping brackets I also added some boost, currently making 16psi on stock heads and bottom end... I am not familiar with your setup, are you using a boost a pump?... if not you should get one as well as a hotwire harness if you don't have one... and you might also consider using meth... with a 255 in tank pump, boost a pump, hotwire harness, 60lb injectors, and meth that was supporting 720ish to the wheels at 12psi with no issues, that was about maxing out the stock returnless system though

romandian

so it is a little strange i make 11.5 psi with the restrictor. im getting 4.4v on the 2 bar sensor. good to know the returnless system is good for 700 hp. (rwhp?) i thought i was getting the boost a pump but the kit came with the lingenfelter pump. the bap is probably a better idea now than the harness, because i see the plug at the pump being a major restriction for the current. those tiny pins are a joke. any bosh injector connector has several times the contact area. if i touch the fuel system i will have to retune the engine, though, so alkohol injection with a good controller might be an alternative. im researching that now, because i will not touch methanol and the precompressor setups look promissing.

btw, if you say you use the manual tensioner first and then just release the sprung tensioner, how much tension do set it to? i guess more than gm specifies stock?

edit: there probably is no spec, you just put it on, right?

schpenxel

I usually try to adjust the manual tensioner so the spring loaded tensioner starts out "maxed out" all the way open. Not always possible but that's usually what I do

nullpointer

Where do you have the restrictor plate installed? I didn't see pictures of this in the thread.

Did you test for leaks in front of the blower? This would negate the plate.

I barely made 7psi with the plate in, but I also have more motor work.

romandian

restrictor is in front of the screws.

nullpointer

Interesting that it made that much boost, does HPTuners have the correct MAP sensor data?

romandian

today was the big day. i removed the ecs restrictor. results:

i picked up

3500 rpm 1 kpa
4000 6 kpa
4500 5 kpa
5000 7 kpa
5500 20 kpa = 180 kpa
6000 22 kpa = 197 kpa

it makes perfect sence, the increase gets larger after the torque peak. some of the gain is due to the colder weather, however. i made only two pulls because mixture was leaning out slightly. also in cold weather i get traces of knock @ around 4000 rpm, so i didnt want to push it. why it flattens off on top i dont know, but i will find out.

i will be ordering some torco tomorrow from the british dealer, the us guys didnt want to ship it, so ill have to pay the higher price. hopefully this will eliminate any real detonation and i will be able to see, if leaning out the mixture picks up any more power. im at 11.4-11.5 at 15° now. race cars run 12.2 i understand.

so is the engine making 650 hp now, all stock except for the blower and bassani mufflers? what do you think? 180/95 kpa x 345 = 653 and max power should be higher that at 5500.

or do you think the stock engine will give up the ghost at theese boost levels? im running v-power 100 octane, 95 aki probably.

edit:

the boost sensor as loged from the pcm is fluctuating quite a bit, like +/- 2 kpa and is not consistent with the voltage reading i logg also. thats why i put a restrictor in the hose to the sensor. as im still having acceleration enrichment issues, i removed it recently. i might put it back in there to smoothe out the boost readings a bit.

ONE BMF

Methanol is your friend, i highly recommend you get Julios's " Alky Control " setup and tune it" meth non dependent" that way your motor will always be safe even if the meth pump fails. A single nozzle setup is all you'll need for now.There is no finer product and well worth every penny of insurance it provides.

romandian

i have been giving that a lot of thought. however i decided to go with torco. its cheaper and simpler. it seems you have to inject around 40% of fuel to get real benefits of water/meth. how do you want to tune "meth non dependent"?

will you meth guys tell me one thing, please: how does a 50/50 mixture work in winter. im seeing 15°c iat now. so in theory the water should freeze in the manifold and even with straight meth the humidity in the air should freeze. what does really happen? no problems with that?

its also very weird you can get meth that easyly in the u.s. i have yet to find a vendor that will sell me meth as a private person. also there is absolutely no meth in windshield fluids over here. well, no wonder, as it is poisonous as hell, even if you get some on the skinn its bad.

schpenxel

I'm not sure how 15*C would be freezing? Water freezes at 0*C, methanol freezes at like -100*C or lower.

The back of the intake valves are ~300*F, so anything that is frozen is going to be boiled real quick

Most around here run 100% meth anyways.. no 50/50 mix

I'm not sure why it's so hard to get over there. That's strange.. I've literally never heard of any issues with it here. I've heard of more issues with antifreeze than methanol

romandian

so you dont see problems in winter?

injecting a healthy dose should lower temps by 30°c or so. so id have -15°c. on the first pull in wont matter for sure, but how about racing it?

i had ice on the outside of the manifold on my turbocharged car with spraying on the cooler only.

schpenxel

I haven't had any problem so far.. it was right at freezing ambient temp this morning and everything seemed to work perfectly normal. AFR's stayed in line with meth on, etc. Mine would be quite lean if it weren't working right

My guess is the intake valves/cylinders are hot enough that the meth doesn't stay cold enough long enough to really matter

That's pretty neat about your manifold.. I read that some methanol powered cars run so cool they can get away with not running radiators. That's pretty wild!

Well, let us know how it goes

I'm running one M15 nozzle, controller on 9 currently