Spool Stats T66 ball bearing

[Mad_Trbo]

Looking to see how quickly I should expect a t66 to spool wiht a 3200-3400 stall.

I am expecting less than a second once in WOT. Anyone have any logs or just common knowledge which might give me a baseline expectation point?

I am seeing a couple of seconds and thinking it must be a leak which in itself doesn't completely make sense to me. But I know I continue to see posts with exhaust leaks explaining poor spool up results. Seems like it would have to be a significant leak to really hender spool. Timing in my opinion is often the culprit.

 

[Mad_Trbo]

So should this turbo spool pretty quickly understanding it is a decent sized turbo.

 

[turbo2nr]

My T70 spools pretty fast on a stock motor and heads. I guess my stall is around 3200 (Who knows?) I had a TE67, 67mm gT compressor wheel, and that spooled too fast believe it or not. I keep buying bigger turbos to match traction. Why spool fast if it won't stick?

 

[TurboBob]

Everyone defines "spool" differently.

Are you talking brake-torquing, punch from idle, kickdown on the highway.....

How do you define spooled? full boost, fast rising, or just over some boost?

What is your boost set to and how is it controlled/adjusted. The wastegate configuration has a lot to do with spoolup.

Are you running a stock MAF and/or stock intercooler?

Leaks at the header-turbo flange can affect spool more than you might think, as well as wastegate sealing (the puck has to cover the hole properly, and have good tension)

Timing is a 2-edged sword, retarded timing increases heat, but reduces flow, so it can assist in building boost when braketorquing sometimes, depending on your combination. Some combinations respond better with more timing.

Bob

 

[Mad_Trbo]

I suppose my question was a little vague in terms.

When I am speaking of spool, I am talking straight street driving, sitting at a stop light. Right foot comes off of brake and immediately goes into gas pedal full WOT.

Using a log I look at when TPS = 100%, what is time and where is boost compared to where I want boost to be. However long it takes to reach my max boost setting @ WOT. That is what I call spool.

I am controlling boost with an electronic boost controller Apexi AVC-r. I have an external wastegate and I am limiting boost to 15lbs.

I have the FAST XFI and I am set to do Speed Density so no MAF. The only place I may have an exhauslt leak is driver side exhaust manifold. Everything else is sealed tight.


TurboTunr When you say traction was a problem how so? I am still not clear on the vernacular. Do most people have a problem with traction from a stop and straight into the throttle. Or when power braking?

My biggest issue is I have no baseline on these cars, I have no clue as to how they should run in stock trim. When I bought the car it was a wreck barely running.

 

[Slo86GN]

I'm with turbo2nr on the non traction issue...lol. I kind of set myself up for it though.....3200 stall, ported heads, cam....and a Cheetah Stg 3 turbo...made for an ummmmm, interesting driver. I could sit at a light, floor it from an idle, and before the car had moved even a carlength, the tires were spinning. I'm hoping my GT6152 will spool just a hair slower, but I have a feeling it will be just as bad....gotta love it... :biggrin:

 

[salvageV6]

From full idle vacuum to 15psi. I would think 2 seconds is about normal in a moving car.

From 8psi. to 25psi. it would be much quicker like when they tested those GTQ turbos and others in that magazine.

I always wondered why they left out the real spooling data on the chart.

I usually test from 0 psi. to target boost for spooling.

Easy to hold that 0 psi. anywhere for launching.

Lots of ways to define spooling I guess.

 

[Mad_Trbo]

I see and when I first started driving the car I had some **** tires and when I would go WOT. The tires would just break free and forget about catching traction. I then put some new tires on the car and went with an Eaton and haven't had the same results since. But based on everything I am seeing it seems typical and expected with the set up I have.

As for timing I am trying to get a concensus on how you guys ramp up timing. Seems like the school of thought is around 18 degrees flat throught the RPM band when holding about 18 -20 lbs boost. Where as everything I have learned says to advnace timing gradually up the RPM band. Love to hear the thoughts of most

 

[turbo2nr]

Every turbo I've tried has been insta-spin of the tires. I'm using MT drag radials. Now with the T70, it is pretty much matched up. My converter must be looser than what I think, or something. On a cold day I can have them break loose just stomping it from a light. Don't know about summer, my stuff is kinda new.

 

[salvageV6]

I did some testing this evening that wasn't so kind to my snow tires.

I am thinking 1.5 seconds would be more in line from idle to 15psi.

I found a pressure transducer I can install, and try to log boost with my direct scan using the MAT input.

I have the double BB Innovative 70 p-trim with probably the same 3200 protorque converter.

Can't time it with a stop watch.

I'll get back to you on this thread in a while with some more realistic/accurate data to compare to your accurate tests.

I also have a boost switch I could set to 15psi. that triggers a relay and could modify the MAT input with two set voltages to record and play back on direct scan one voltage below 15psi. and one above it.

That would be quicker to install and test.

 

[Mad_Trbo]

I appreciate and look forward to it Salvage.

There must be something up with the tune on mine, I don't get the smoke em effect on the tires. Not that this is the effect I want long term, I am just wondering about the performance aspect and if I am where I should be.

I really need to take a ride in one that is up to par.

 

[turbo2nr]

Do you have a catalytic converter?

 

[Mad_Trbo]

no cat on the Menace

 

[JCotton]

What size tire did you have and what size did you upgrade to?

 

[Mad_Trbo]

When I purchased the car it had the stock configuration in tires and I went with same set up in a really cheap brand to get me by while the custom shoes were being built.

The old tires were no good(dry rot etc....) though, they had been sitting on the car 5 plus years, so that is part of the explanation.

 

[salvageV6]

Got the boost logging harness built and calibrated using an Omega lab. grade pressure transducer.

Works great and is calibrated nicely for use with direct scan for logging.

Did 2 tests, time started at first frame 4.36tps and 0mph.

First test was as follows:

1.30 sec. to 5psi.

1.65 sec. to 10psi.

1.92 sec. to 15psi.

2.25 sec. to 18psi.

Second test was:

1.54 sec. to 5psi.

1.81 sec. to 10psi.

2.03 sec. to 15psi.

2.36 sec. to 18psi.

Both tests had wheel spin for several reasons, still on snow tires and there was a bit of sand in the breakdown lane I used to launch on the highway ramp. Too much traffic to stop dead in a lane.

Tire spin occurred on both launches but wasn't excessive but certainly would have unloaded the car a bit.

I think they can be improved with the drag radials and a clean road.

Good thing to look forward for in spring.

 

[Mad_Trbo]

Everything lines up

Ok, so based on your stats it looks like we are lining up.

I still need to find one of these cars to ride in locally just so I can see how they perform. I have in some eyes the misfortune of growing up on a much lighter platform with abou 475 crank horsepower. So I think this messing with my expectations.