Chris Ng

How much does your car weight and what year? My FB was 2720lbs with me in the car. Just wondering, thanks.

chuck

Hey Chris, thanks for chiming in. Good to hear from another person that runs this turbo, not many of us around. Have a few questions for you.



What kind of dyno did you run your car on just for curiosity sake?

Do you notice a big difference between power levels with 11-12psi Vs 14-~17?

Have you ever had any boost creep with this turbo?



Thanks!



[quote name='Chris Ng' date='Jun 1 2005, 04:27 PM']Just for comparison Set, I'm running the same turbo as you are, TD07-25G .. dynoed at the end of last summer .. 371rwhp@14psi...

This was on a 3mm motor with a very small streetport (might as well been stock).. 70psi compression numbers.. the motor wasn't the strongest..



the motor has just been rebuilt and now runs 2mm seals and a muhc larger port job.. we'll see what kind of power diffrence it makes once I get it broken in.. however, looking at your hp and torque curves, they are very similar to what I saw on my dynographs..



With a car as light as an FB, I'm sure you car is quite a bit quicker @ 293rwhp than my heavy boat @ 371...nice goin..


[/quote]

Hey setzep, I think you'll find that turbo really wakes up at around 15psi ish. https://www.nopistons.com/forums/pub...IR#>/bigok.gif

[quote name='sleeper7' date='Jun 1 2005, 03:51 PM']Chris Ng

How much does your car weight and what year? My FB was 2720lbs with me in the car. Just wondering, thanks.

chuck


[/quote]



Chuck, I have an 88 FC.. last time I weighed it, it was aprox 3100lbs with me in it..

[quote name='setzep' date='Jun 1 2005, 05:39 PM']Hey Chris, thanks for chiming in. Good to hear from another person that runs this turbo, not many of us around. Have a few questions for you.



What kind of dyno did you run your car on just for curiosity sake?

Do you notice a big difference between power levels with 11-12psi Vs 14-~17?

Have you ever had any boost creep with this turbo?



Thanks!


[/quote]



The run was made on a dynojet, so all tihngs being equal, our numbers shouldn't be as far apart as they appear on the dynographs themselves..



As for the turbo, I found that there was a night and day diffrence as soon as I ran above 13psi.... running anything below that, power came on very linear.. but didn't give quite the same rush as my old hybrid setup gave.. as soon as I cranked things up past 13psi, things really started to come alive, power was linear right till crossing the 13psi threshold, then you were pushed back in the seat...



I'm currently running a tial 40mm wastegate with a 9lb spring.. when I first installed the turbo, I ran open vented wastegate just off spring pressure, and didn't notice any creep whatsoever... however, I then plumbed the wastegate back into the exhaust.. after doing this, I noticed that I would creep 2 and sometimes 3 psi as soon as I passed 6500rpm.. part of this creep could have been due to the sharp turn I has on the dump tube when plumbing it back into the exhaust... I have since gone back to open venting the wastegate in hopes that I can get rid of the boost creep..I'd rather have the car be louder, then run the risk of overboosting... The only other change was the fact that I had installed a profec B for boost control.. I have heard conflicting stories by some people.. some noticed boost creep using the profec, while others had not.. either way, once the motor has a bit more mileage on it, and I start to bring the boost back up, I'll make sure to find out if the creep is due to the profec, the wastegate dump tube design, or jsut inherent in the turbo setup itself (I recall your postings on the other forum regarding your boost creep issues)



by the way, here's a link to my dynochart if you'd like to compare:

http://members.shaw.ca/sumps/sept2504dyno.jpg





Anyways, as IGY has mentioned.. at 12psi, the turbo really isn't stretching it's legs yet.. turn the boost up by a couple of pounds and I'm sure you will find a whole new world https://www.nopistons.com/forums/pub...IR#>/smile.png

Your dyno looks pretty bad once it hit 6200rpm, is that from misfires/detonation? I bet it could have made more power if that problem was taken care of.



http://members.shaw.ca/sumps/sept2504dyno.jpg



Sounds like I'll have to turn up the boost a bit (hmm... I think I have a 13psi spring in the garage) to get more bang for my buck.

I think my boost creep issues that have plagued me in the past and a little right now are due to my small main runners being 1.69"ID. This is the smallest I've herd someone running. Maybe the velocity is just too high? But anyways, I'll try running more boost and see if the creep goes away or gets worse.



Thanks guys!

creep should go away if you raise the boost, think of creep as the minimum boost your engine/turbo/wg/manifold setup can run, if you raise it over that you should be just fine

[quote name='j9fd3s' date='Jun 3 2005, 01:10 PM']creep should go away if you raise the boost, think of creep as the minimum boost your engine/turbo/wg/manifold setup can run, if you raise it over that you should be just fine


[/quote]



at 15psi, I end up creeping to 16-17psi at 6500rpm ... I don't really want to have to turn boost up to 17psi just to keep this from happening https://www.nopistons.com/forums/pub...DIR#>/wink.png



Setzep - All my dynos, including ones when I was running a hybrid, showed the same breakup as you see on my chart at the same point.. I used to think it was ignition related, however, this breakup occurs no matter what boost I'm running (I also do not "feel" the car runnign any diffrently at the point of the breakup) .. I'm leaning towards the problem being with how poorly my motor was built by the previous owner (not his fault, but the engine builders) ... once I put the car back on the rollers, we will see if it acts any diffrently (jsut rebuilt it.. has 30kms on it now)

Mike- The same thing would happen to me when I ran the 13psi spring in the wastegate, it would end up drifting a couple pounds higher by 7k.



Chris- How do you think an engine itself could cause strange ripples on a dyno graph? I thought ripples were always from the engines peripherals (whether it be ign or fuel related). Or maybe it's from wheel slippage/hop on the dyno? When I'm passing 6k in the boost to tell you the truth I could probably loose 30hp due to some kind of misfire and I woulden't be able to tell the difference cause it revs so fast up there. Are ignition related problems normally boost related or rpm related? Maybe a datalog would be able to tell if you have any "blips" of incorrect rpm if you haven't looked at that already.

congrats on the numbers, Setzep! i'm fairly sure you can eek some more out of that motor with some finer tuning.



what kind of wastegate and exhaust setups are you running?