I'm using a set of late 70's WorldCastings Sportsman 200 heads with a 64cc chamber with my TPI, basically already had them from a friend, so they were practically free, anyway, it surges a little and sometimes seems to bog alot. On the scan tool, it goes from super rich to moderately lean while depressing slowly on the pedal, usually its about right at WOT though.
I'm thinking maybe the gas a nd air are not mixing properly due to the chambers.
The Short Term Adj vary from 90-160 when 128 is supposed to be perfect and the Long Term Adj is usually in the 105-115 range.
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Should these heads work ok with a TPI setup??
They are polished and am running a ZZ4 cam with a ZZ4 short block assembly.
Would L98 heads work better?
Thanks

 

Look at my sig.

Are those things in your truck?? 200cc's certainly doesn't have low end torque in mind like a truck should. Those heads come into their own at high RPM's, which is exactly where stock TPI sucks

 

The chip needs to be changed because of the heads.

 

Extensivly from my experience.

 

tpi_roc, they are 64cc chambers, hope thats what you meant, the Sportsman 200's I believe are the same as the Sportsman II's in your sig, just changed names over time I think.
I've tried a variety of chip programs from different people and none seem to work very good for part throttle or cruising. The chip I'm running now is basically a stock TPI one and is very rich at idle and low rpm cruise, how different is yours from stock on the timing and fuel curve? Or where did you get yours done at?
I'm using the stock 22# injectors.
Thanks

 

I burn my own chips and my fuel seems to be just about right on now.

I used an ARAP bin with graphed in AUJN timing. Its starting to really come into its own and pull like crazy.


But remember you're driving a truck, not a camaro there will be differences in how it feels. The sportsmans have a huge intake runner, especially for a 350, and it needs to be a pretty healthy engine to make them work how they were meant to. They'll never make lots of power unless you rev them, just like my car. I can hardly get the tires to spin and its a great thing. I launch in second and let the car do 1st gear all by itself, no spin, Climb it through second and when i hit about 3k rpms the thing takes off like a rocket and pulls up to 5,500 and a little beyond, if you're not reving your truck it will feel weak.

Also I'm not insulting your abilitys at all here... But what are you judging your "slightly lean/rich" statement from? You say it looks right in WOT, but in WOT your 02 sensor isn't in use. Its open loop at WOT. And things will certainly fluctuate. From my scans I'm right on at part throttle and under most driving conditions, when i get on it and decell it goes rich right at decell untill the computer has had enough time to adjust to the 02's rich readings.


Anywho, when you go from the stock 155-160cc(?) intake runner to a sportsman 200cc intake runner you should expect some of the things you're experiencing.

The surging is the only thing that sounds to be an issue, I have a very light amount of it at idle but its because I haven't cleaned my IAC forever and I'm having to much fun finally driving it

 

Also For comparison I'm using 24 lb/hr LT1 injectors.

Sportsman II's are the heads.

200(cc) is the intake runner volume.

64cc Is the combustion chamber size.

 

THanks for the info tpi_roc, I'm no expert when it comes to the heads, didn't realize the 200 was the intake runner cc's. As far as the rich/lean conditions, its by watching my DataMaster scan tool and the Short Term Adj. cell, its way low around 85 or so at lower rpms and idle, and surges alot. But will also have some surging, but no detonation at higher rpms under load while the Short Term Adj is around the 145-150 mark, running leaner. At WOT, which seems to be about when the MAP pressure reads above 90, 100 being astomospheric pressure, and the Adj cells ar locked at 128, it pulls fairly well and the O2s are in the low 800's. The DataMaster still shows it being in "Closed" loop even though the Adj cells are at 128.

 

That is pretty lean...


22lb/hr injectors (especially without an AFPR) is reallllly pushing it for some performance heads with 200cc intake runners, you gotta feed the void that is the sportsman runner with alot of fuel.


I'd recommend upping your injectors, getting an AFPR (if you dont have one) and start tuning (if you dont). If you decide to start tuning our engines are similar enough that I can give you some prom bins or advice as to whats worked for me.

 

Holy chit.....

I just checked out your webpage and questioned why the hell you need any help?

Damn you've got some toys!!!! Those are some sweet A5S rides man.

TTA especially

 

Thanks tpi. My knowledge when it comes to internals is just enough to get me in trouble usually. I've put together a few motors, but when it comes to matching up parts, that where the trouble begins. All of the cars I have are all stock internals except for the truck, hence all of my problems. The TTA is for the most part, 100% stock except for a few little things that the factory should have done, like the oil breather line going right into the turbo, then settling in the IC. The Black 79 TA I don't have anymore, need to get some new pics of the 10th Anni TA on there, its my wife's car along with the Conv TA.
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I do have an AFPR, set at 43 with line off, if I crank it up any more right now it will just get richer at low rpms, there's just no one around me close that know enough about TPI's to burn one for the heads. I don't have the equip to do it, I've thought I'd start trying sometime. With the GN, there's a guy in the local Buick club thats nationally know for his abilities and he has always supplied me with chips for it so I never really needed to learn.
I do have a 1/2 dozen or so chips laying around, I'd be happy to pay you for your time if you'd like me to send you a couple and you can try a few different bins on them for me to try.
Email me and let me know.
Thanks

 

tpi_roc, if you can, send me the bin files you have used with the Sprotsman IIs and I'll have my buddy in the Buick club tailor them a little for my EGR and injectors etc. He said he been pretty good in the past with TPIs as well. I understand if you don't want to get into trying to burn some for me.
My email address is in my profile.
Thanks for all your help.