#43751 - 09/20/08 02:52 PM
Re: turbo 292 write up
[Re: tlowe #1716]
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tlowe #1716
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Registered: 04/01/04
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Loc: Dysart, Iowa
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went to the track last night. what a great evening, mild temps, track was warm and racing started at 630 pm. there was a small group of racers and i went thru 8 times. i sure i could have easily made 10-12 runs.
ran 3 times to see what the converter would change for me. all i noticed for the 3 runs was a .1 reduction in the 60' times. so from a 2.2 to a 2.1 or so.
with the next 5 runs i changed the rear tires for the stickier set and lighter rims. the car now will tick off 2.0 60' times consistantly, but that was it. i was cutting some really good lights, generally from a .075- a .3. there was 1 that was .003 . all said and done i am maxed out at a 8.805 in the 1/8@ 79 mph. our track is a 1/4 mile track but they will not let us run it because the floods wrecked the far end.
this winter i am going to modify my head to open up the ports and gain back some more performance. still going to go with the dividers in the ports as they help witht the fuel injection.
made a few guy's scratch their head as to why a straight 6 can blow away the v8 camaros and mustang gt's. one mustang i ran would take me off the line and then i would just walk by him waving the whole way. asked him if he was taking off hard and the letting off. he just grumbled. tom
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#44587 - 10/25/08 06:06 AM
Re: turbo 292 write up
[Re: Nexxussian]
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tlowe #1716
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Loc: Dysart, Iowa
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it is a lockup convertor. i tell it when to lockup. they are not variable stall though.
hank, after driving the car around quite a bit. have noticed a few things about the convertor i have.
taking off at wide open is great. engine rpms pop right up, performance is better.
taking off at part throttle feels weird. engine goes right to about 2k rpm and stays there while car slowly accellerates. it is like it slides thru the gears. i do not like that. if anyone has driven a forklift around and noticed how the engine revs and the machine does not move quickly will know what i mean. maybe my convertor has a higher stall. but it sure feels slippery at low throttle take offs. when the lockup hits then all is ok. for the person in town though i feel the trans would get real hot. tom
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#44611 - 10/25/08 03:11 PM
Re: turbo 292 write up
[Re: tlowe #1716]
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Mean buzzen half dozen A.K.A. Hank
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Registered: 09/23/04
Posts: 4545
Loc: Ca
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Tom,
it sounds like your converter might not be that efficient as it could be. 
What brand torque converter did you end up installing?
I think there are a few tricks you can do to the trans to help with the slashy/slippery shifts.
Up to a certain stall,you can use a standard trans,but after about 2600-2800 stall range ,some people recommend higher trans oil pressure,.501 valve,& other things.plus a shift kit always helps. I am not a tranny expert,but my friend is.
If you can hold the brake pedal,,, really mash on it & try to build up boost,what rpm does it go to before the wheels start breaking loose? That should tell you approx stall.
The trick thing to do on Syclones & Typhoons is to lockup the torque converter as soon as it shifts into second gear.
It droped my ET .2-.3 tenths, & about 3 MPH.
The 4.3 V-6 in my truck is just a torquey engine that cannot rev @ all,you really do not need to go more than 4500-4800 max RPM
Here are the V-4.3 cyl head flow tests numbers.
BOTH sets of numbers are with 2.02 and 1.60 valves.
Stock heads have 1.94" intake 1.50" exhaust.
before, intake: 65,133,163,174,178
before, exhaust: 51,102,131,139,141
Pretty weak,,,,cam is like .370 lift.173 degrees duration @ .050
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#56382 - 03/25/10 08:20 PM
Re: turbo 292 write up. with more youtube vids.
[Re: Mean buzzen half dozen A.K.A. Hank]
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tlowe #1716
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Not so good! But one thing is different. The individual runners help by design to get a better (even ) fuel air distribution to each cylinder.
You must have been looking for a long time. Spend some time getting that camaro on the road. Tom
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#56664 - 04/08/10 06:11 PM
Re: turbo 292 write up. with more youtube vids.
[Re: inline300]
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tlowe #1716
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That turbo 292 is still running strong. No problems with it, lately. Hard to keep the mice out of that Elco in the winter. I hate mice!
You got any inline action going on?
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#57418 - 05/03/10 08:53 AM
Re: turbo 292 write up. with more youtube vids.
[Re: Mean buzzen half dozen A.K.A. Hank]
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Mean buzzen half dozen A.K.A. Hank
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Registered: 09/23/04
Posts: 4545
Loc: Ca
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Found the flow of the stock 1991 4.3 V-6 1.94" intake Syclone head.
The stock heads flow:
(164 @ .500" - Stock)
How does that compare to the 1.72" or 1.94" siamesed head?
MBHD
1.72" intake valve stock head.Numbers By Tlowe
050" lift 27.3 cfm
.100" lift 52 cfm
.200" lift 103 cfm
.300" lift 149.5 cfm
.400" lift 164.6 cfm
.500" lift 168.5 cfm
Expect the same airflow on 1987-1995 SBC truck heads ,those are the worse heads for flow,,but even w/that bad aiflow,my Syclone has run 12.0 in the 1/4,just goes to show,when you are forcing air through highly restrictive cyl heads, it's still possible to run OK.
Side note,,guys w/there Syclones swapped to better flowing 1996 & newer Vortec heads & run approx 1/2 second faster in the 1/4 mile,so good flowing heads,are a must if you want to go fast.
Just a quick reference
MBHD
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#58924 - 07/05/10 06:17 PM
Re: turbo 292 write up. with more youtube vids.
[Re: jalopy45 #4899]
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tlowe #1716
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Registered: 04/01/04
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Loc: Dysart, Iowa
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You are a quick reader!
I have the cams instock.
The factory GM computers would not allow you to really tune the engine. The Holley one I use allows plenty of tuning capabilities. And it is easy to do.
I use a inline fuel pump for my application, it will supply all the fuel ever needed. You will most probably need add a sump to the tank to get rid of fuel slosh. Use the old fuel line for the return.
Here is a update for everyone else.
After dynoing the 292 and the 250, I have finally got some time to work on the ELCO.
A reminder, My engine is multi port fuel injected and I found that it ran better with divider plates added to the intake ports. This inturn made the intake port window too small, yet the car responded well and recorded a time of 13.8 in the 1/4 mile. This is a street car, just weighed this week @ 3700 with me in it. It is ran down the track in drive and shifts at 4800 RPM
Well now I have machined a head with a much larger intake port. It is taller and wider. A much better designed divider is installed and the engine was running fine before the convention but I was chicken to drive it 1100 miles each way going 75 mph not broken in or untested. Over the last 2 weeks, many miles have been put on it. The tune has been improved and let me tell you , the engine has changed! Used to run 11-12 PSI at full boost with old head, now it runs 7 PSI and has more power. Hope to take it to the track Fri night for test and tune runs. Will also see about getting that boost pumped back up. Tom
Edited by tlowe #1716 (07/05/10 06:19 PM)
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#58949 - 07/06/10 03:10 PM
Re: turbo 292 write up. with more youtube vids.
[Re: Harry 6674 II 5760]
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tlowe #1716
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Registered: 04/01/04
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Loc: Dysart, Iowa
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#58961 - 07/06/10 07:52 PM
Re: turbo 292 write up. with more youtube vids.
[Re: tlowe #1716]
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Mean buzzen half dozen A.K.A. Hank
Active BB Member
Registered: 09/23/04
Posts: 4545
Loc: Ca
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You are a quick reader! I have the cams instock. The factory GM computers would not allow you to really tune the engine. Not sure if that's true,you do need to get the correct tunning items/equipment to do so.
Guys tune there 1991 Syclones & Typhoons w/there factory ECMs http://www.code59.org/index.php?option=com_fireboard&Itemid=69Guys have been tunning there factory ECU's on Buick Grand nationals & turbo T-Types for even longer.
Just need to know where to look.The Holley one I use allows plenty of tuning capabilities. And it is easy to do. Well now I have machined a head with a much larger intake port. It is taller and wider. A much better designed divider is installed and the engine was running fine Tom
Need pics of the mods,this post is worthless w/out pics IMO.
MBHD
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12 port SDS EFI
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#58962 - 07/07/10 04:39 AM
Re: turbo 292 write up. with more youtube vids.
[Re: Freds Garage]
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tlowe #1716
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Registered: 04/01/04
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Loc: Dysart, Iowa
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Fred,
Eventually, would like to see this Elco in the 12's. I have another Elco to be kept on a strick diet and setup more for racing. Who knows, Harry (Turbo6) has his car in the 9's. Tom
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#58963 - 07/07/10 04:40 AM
Re: turbo 292 write up. with more youtube vids.
[Re: Mean buzzen half dozen A.K.A. Hank]
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tlowe #1716
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Registered: 04/01/04
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Loc: Dysart, Iowa
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Too busy working in the shop. Teaching the kids how to wrench.
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#58988 - 07/08/10 07:06 AM
Re: turbo 292 write up. with more youtube vids.
[Re: tlowe #1716]
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tlowe #1716
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Registered: 04/01/04
Posts: 2327
Loc: Dysart, Iowa
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Here are pics of the modified port as installed on my car. The divider was made by Strokersix from this BRD
Modified intake port
Stock intake port
Modified Clifford intake
Notice how the injectors aim straight at the correct port. I also had to make my own intake gaskets from material ordered from McMaster Carr.
Cranked up the wastegate last night, could not test because of rain. Maybe tonight will get to. Fri evening is test and tune at track. Tom
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#58996 - 07/08/10 09:32 AM
Re: turbo 292 write up. with more youtube vids.
[Re: strokersix]
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tlowe #1716
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Registered: 04/01/04
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Larry,
It may just be the angle of the pic. Tried to port the intake to be symetrical. And as Strokersix has said the divider is centered on the bolt boss hole. The port is much larger as seen in the pics than the stock clifford intake entry. There is not much material left to seal with a gasket, thus custom cut gaskets of good material. There is only about 3/16 of gasket sealing in the upper corners of intake port. So far so good.
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,,,having kids & a wife w/a different work schedule leaves little to no time for my projects.
God doesn't like ugly.
