Smitty

up the fuel pressure alittle when you got your 6lb pulley back?

Smitty

didn't you install an extra injector or something?

ModAddict

Could be the FPR, right? I just wouldn't think the pump would be bad allready, plus you've had FPR issues b4.

ModAddict

scalbert

The extra injector was diabled; the fuse for it was pulled. I did bump the statis pressure to 70 PSI, but this was only up 3 PSI from where it had been. The FPR is RPM independant; it doesn't care what the revs are. So the most likely suspect is the fuel pump which is easy enough to test.

I'll pull the pump tomorrow to check the filter and connections.

Smitty

What kind of weather are you experiencing over that way?... did you notice any knock/detonation?

Besides you pulling the intake manifold.. didn't you just install your gauges?.. could your T for the fuel pressure sender not be the right size?, maybe causing less flow when your dumping large amounts of fuel?

scalbert

The weather won't affect the direct fuel pressure measurement where the sending unit is mounted. It is tee'd right in with the return line. The fuel pressure gauge has been in there for a litttle while; I just added the boost gauge back in. There should be constant fuel pressure in relation to boost.

No, this is a fuel starvation issue. Whether it is a clogged filter or a less than desireable fuel pump will need to be determined.

But anyway, there was no klnocking so it is getting enough.

ModAddict

Kind of OT but I still think we're getting more pressure than we need. Look at graph 3 on the FPR instructions. It is not even close to what we're getting. When I discussed this with Shad a month ago he simply said I could turn down the static a bit but headers could make a difference. I think the 2.72" calibration washer might be a better fit for this set-up. Here's the instructions, look at the graph on the bottom of page three.
http://www.comptechusa.com/instructions/ins036.pdf

edit,...Even if we got what the graph said we should, it would be better!

scalbert

Get those headers on there... I am really curious how they will impact the A/F ratios and boost observed.

ModAddict

I could have been fighting with those right now, but that battle will have to wait another two weeks. They are being converted over to "Super" Stone Racing headers by Swain Tech.

ModAddict

Do you recall what Denso plugs came with the kit? I'm going to go ahead and change them while the blower's off. IK-20's ?

Smitty

Denso IK 22

ModAddict

Thanks

ModAddict

Steve, how did you end up with this?

scalbert

I now believe boost was dropping but not seen by the boost gauge. My gauge has been acting funny; sometimes showing only 3 PSI boost, sometimes 6 PSI and I have even seen 30" hg vacuum.

I'm going to install a pressure transducer on the boost line along with tap into the fuel pressure gauge sensor and run these signals to a portable data acquisition system. This way I can map the boost to fuel pressure and correlate such an occurrence.

I did talk to Shad who gave me the Walbro part number and stated that it is the highest flowing replacement pump offered. He seems to think that the belt is slipping up high which could be the case. I didn’t tighten it down to their specification since it felt very tight with about 12 – 15 lb/ft on it.

ModAddict

When I first installed the blower, I had the blower belt off the pulleys by one rib. The belt would slip and cause a vibration at the top. I found the problem right away and all was good. When I installed your High boost pulley, the belt was so tight, I couldn't get the tensioner pulley on. It didn't take long before the belt stretched and the vibration was back. I was able to reinstall the tensioner, and all was good again,... for a while, then it came back again. When I installed my own HB pulley, I went to the next size belt, and after re-tightening one time, all has been good for a while now. I actually torqued the belt slightly higher than spec, tightened the two clamping bolts, then loosend the tensioner and re-torqued to spec.

Smitty

I actually did the same, but not much more, since it stated very clearly that putting too much tension could screw up the Shaft on the blower unit..

ModAddict

Yes, not much more, just a bit. Did you get your pulley yet?

Smitty

nope... still waiting...

Got the Gaygiz completly finished..

32 at idle on the fuel+ 18 vac boost at idle

scalbert

BTW, too much tension may cause the tensioner pulley to fail. But how much more is unknown.

I went back and re-tightened to the 24 lb/ft spec and will observe the values.

JaDia4

Guys,

I've been reading this post over the past couple of weeks, and I don't quite understand everything you're talking about but I'm still learning from it. But I don't remember reading what your ultimate goals are. Meaning are you trying to achieve a specific amount of PSI or HP or Torque, or combo of those 3? After making so many changes to your car has gas milage changed alot? Has the amount engine noise increased? Thanks. I think what you guys are doing is great especially sharing ideas from so far away from each other.

ModAddict

The goal is to maximize the output of the Comptech S/C kit on our cars. We can only spin the blower so fast, but everything around it can be tweaked to maximize the output.

Sound about right guys?

Smitty

I am just in it for the girls........ hardy har har....

Yeah basically Brad is 95% right... some of us want to go real fast... some of us use this as a hobby.... Believe it or not but I find it VERY relaxing and fun.... Our motrs have alot of detuned parts that need adjusted....

Hmmm... my gas mileage?..... never looked... too much fun smashing the pedal to the floor

types1967

there is nothing like smashing the gas and hearing the sweet sound of the blower as you pass break neck speed,just mod away and soon before you know it we can fly with wings!!!!!!!!!!!!!!!!!

scalbert

Yep, Brad is correct. We just want to get the most out of what we have. And Smitty hit it too; this is for fun too...

Just FYI, I ran some numbers on the whole system with intercooler. I used Corky Bell's formula for determining estimated HP in a supercharged vehicle. I also made an assumption of headers already being added making the engine HP total 290. The results are as follows:

Power = Original Power * Pressure Ratio * Density Ratio * Volumetric Efficiency Ratio * Drive Power Efficiency

Original Power = 290 HP

Pressure Ratio = 8 PSI Boost = 14.7 + 8 / 14.7 = 1.54

Density Ratio = Original Absolute Temperature / Final Absolute Temperature = (460 + 90) / (460 + 112.5) = 0.96
Note: I used an IC efficiency of 0.85 which is conservative in this application and the expected temperature rise as defined in the blower specifications from Magnuson.

Volumetric Efficiency Ratio = SC VE / Engine VE = 0.97 / 0.90 = 1.08
Note: The SC VE was also taken from Magnuson’s website. I assumed an engine VE of 0.90 since this is a Honda engine

Drive Power Efficiency = 0.92
Note: As estimated based on the boost and blower type.

290 * 1.54 * 0.96 * 1.08 * 0.92 = 426 Crank HP

For 6-Speed WHP I’ll use a 17% drivetrain loss: 426 * 0.83 = 354 WHP
For 5-Speed WHP I’ll use a 23% drivetrain loss: 426 * 0.77 = 328 WHP

This is somewhat conservative so real gains may be a little higher. But regardless, 350 WHP should satisfy my urge for quite some time; 370 WHP would be even better.

I ran the same numbers on the currently available higher boost pulley; generating around 5.5 – 6.0 PSI boost. The crank HP came out to 394 HP and 6-Speed WHP is 327 WHP. Again, this is conservative and will most likely be a little higher. But once again, 325 WHP or maybe even 335 WHP will be nice.

Remember, both examples are with the intercooler.

ModAddict

types1967

:wackit: :wackit: :wackit: :wackit: :wackit: :wackit: :wackit: :flamer: :flamer: :flamer: :flamer: im happy!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Smitty

354 Wheel horse power.......

scalbert

Thought ya'll might like that...

Nashua_Night_Hawk

Ah, according to my trusty calculator, the problem is not WHP it is traction. best on street tires would be low 13s in 1/4 mile, anything above 300 WHP would be wasted as just tire spin.

350 WHP CLS is nice to have... Bragging rights, no?

Nashua.

Smitty

Nash, once again, let me/us reiterate...(sp?). this is not all about 1/4 mile times... Read from the top of the page down..


Hey Eric, you better look into Upgraded Axels now, because I know your gonna be dumping the clutch alot....LOL.. yippeee

P.S. Eric ordered the 3.5 upgrade!!!!!

types1967

damm smitty why did you let the cat out of the bag!!!!!!!!!!!!!! its supposed to be a secret.anyway yes i am getting the 3.5 upgrade so with that im adding the blower and the intercooler and intake manifold and raising the boost to max since the new block can handle it.also nashua the traction bars deans workin on will eliminate wheel hop and ill get upgraded axles.so i will be in the low 12s one day well hopefully smitty ill get you lol lol lol hey steve and brad and smitty we have to meet before it gets to cold so brad set up the meet for us maybe virginia?

DeansblackCLS

And I suppose everyone blames me for getting them into this predicament, huh? Great!

Scalbert, ModAddict, typeS1967 and Smitty---you guys rock! I am trying to catch up, but my credit card is begging for mercy.

Hmmmmmmmmm......3.5Liter+boost+aftercooler+tractio n control+axles+sticky tires.......that will be one sick ride!!!!

ModAddict

Dean, just keep the pressure on the tranny guy. Sooner or later these stockers are going to,.... well we'll see. You know what we need,..... High Stall LSD with firm shifting, he, he, he,......

scalbert

As mentioned, it is not about ETs; it is more about having fun and exploring the limits of this vehicle.

But on the subject of power and traction, there is something called control. No need to go WOT in 1st if traction is limited. Plus, I am aware of many FWD vehicles making as much or more power. If properly set up it will be bearable; but certainly somewhat lacking.

scalbert

Damn Eric, you never quit. Way to go man!!!

Just FYI, you know you will definitely need a different pulley as boost will be lower with the same pulley on the larger displacement motor??

scalbert

I have kept your name anonymous from my wife, otherwise...

types1967

steve i never quit i want serious hp!!!!! hows the ic and intake coming along?

scalbert

Look in the other thread.

I'm shooting to have it on the car and being tested within three weeks.

Zapata

I doubt you'll even be able to hold traction WOT in lower gears at 15-45mph....that's a lot of trq and hp....