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I have found that a restrictor is necessary on the Opels. 7/8" seems to work well. If it's wide open the car runs hot, especially above 6500 rpms (water pump is spinning about 7k).

You could...

Try www.delcity.net, they have the cheapest prices I've seen for LED's. A lot of other nice stuff too.

Bob

Line 125 - Opel GT, listed as 102 hp, but that is pre-'71 over-inflated GM rating, therefore it's SAE gross hp. True rating is 90 PS, or about 88 hp. This is correct for 1968-1970 models. For...

In the oil pan, and in your specific car's case, on the driver's side. The exhaust is too close to the pan on an Opel, and gives a false reading.

Bob

FWIW, on a GT-4 engine, on an engine dyno (not chassis), I saw a 4 hp hp increase @ 7800 rpms. I suspect this is because I reduced the water pump speed by 38%, and the alternator speed by 22%. On...

So would this then move the GA16 powered B13's into ITB by default? That would be a killer car in a very competitive class...

Bob

Just FYI, the stock air intake opening behind the grill is plenty large on the Manta. It's just that the factory plastic air collector is necked down too small. I made a new one from sheetmetal, it...

Try Metric and Multistandard Components, they truly have EVERYTHING in metric fasteners, in all grades. Very good pricing too. Not sure of their website, but you could do a search. Their catalog is...

Diane, I have some 215/50-13 Kumhos you can look at, they're about 21.5" tall compared to 23" for a 205/50-15 tire. This is probably the cheapest tire you can get into that is short enough to make it...

I believe I've read that the 32/36 DGV flows 270 cfm, but quite frankly I don't know at what pressure drop that is measured at. One of these days I'll throw one on my flowbench and check to see.
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Cherokee, the GT front harness is not all that tough to make. Figure about 8 hours to remove the OEM front harness, make a new one from scratch, and re-install. I use SXL wire, it takes the heat...

Yes, the aerodynamics suck, but it has about 2% better front/rear bias than a Manta and much better visibility front and rear. Just showing up with ANY Opel is different, but I got the bodyshell for...

My project ITB car is an Opel Ascona 4-door. Now that's an oddball. Most of you have never even seen one, much less raced one.

Bob

FYI Geo, Tim and me have talked about building an ITA B13 Sentra as Tim's next project (after he's done crashing his 2nd Ford Escort...). As you said, we have a lot of experience with the car and...

Geo wrote:

"Actually, don't be taken in by the shape itself. My understanding is the B13 Sentra is more aerodynamic than a C4 Vette. Aero can be extremely deceiving. It's generally not intuitive."...