What do they mean by adapter horn in the drag radial rules as far as turbo, is that the same as a reducer and are reducers allowed?

Adapter/Reducer same 88mm inlet that Al has a go/no-go gauge and I think it needs to come within a 1/16 of the wheel.

What is your combo?

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Neal Chance Converters

Mustang 363 sbf w/brodix inline head w/91mm reduced to 88mm and glide

is the Precision x275-88 legal for drag radial?

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'87 T Type Small Block Turbo

88mm inlet go/no-go. So if if has a 88mm inlet it's legal the way I read it and built ours.

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Do you still have the same car with the sb2 in it? It would be nice to see it back down to ORP.

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Yes, same car and combo we've run around the midwest for the last few years. We're in STL now, so will make the races at Gateway and a couple down at ORP. The turbo is legal in x275 and is a true (large frame) 88, so it should be legal. However, as we found out at a few races (OTT5 was one), the housing is slightly larger than the 88 mm wheel (common sense right?). And a go/no go exactly 88mm is going to fit right through without touching. Just need Marty/Mitch to chime in and give their blessing and we'll be back down for at least the shootout and hopefully a couple more races.

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'87 T Type Small Block Turbo

I made the gage its right at 89mm

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.........Confidence is the feeling you have when you don't fully understand the situation........

Should be ok then. Here are the specs pulled off Precision's website:


Class Legal Turbocharger - X275 88 for most X275 classes

Part Number Part Number: PTB705-5500

Manufacturer Manufacturer: Precision Turbo and Engine

MSRP MSRP: $3,695.00

PTB705-5505 / X275 88
HP Rating: 1,600
This Class Legal turbocharger features the following:
• Exclusive CEA® (Competition Engineered Aerodynamics) compressor wheel machined from a 2618-aluminum forging
• Higher efficiency and faster transient response for maximum power and performance
• 88mm inducer compressor wheel
• Large frame compressor cover with ported shroud inlet
• F or G trim turbine wheel
• Turbine housing options:
- F trim available with 1.0 A/R
- G trim available with 1.0, 1.32, or 1.50 A/R
(All housings feature a 5" V-band discharge)
• Hydrodynamic 360° thrust bearing system

Approved for use in most X275 series found throughout the country. Please verify rules to check legality of the turbocharger prior to purchasing.

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'87 T Type Small Block Turbo

Man I would just measure it, that way u don't run into the same problem u ran into last time