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Hey guys, I recently decided that i’m going to replace my tb since it’s on its last legs and I’ve done all I can to make it last. The only problem is that when I look online for a replacement, I can’t seem to find a stock 48mm tb new. I do notice that there are lots of 52mm tb’s, specifically BBK. I was wondering If it would be possible to just get the 52mm while having a stock engine. Would it make it run too lean? Or would the car be able to adjust to it? Id appreciated your input since I’m trying to get this done ASAP
It won’t make any difference. I put a 52 mm Holley on my 89. But the volume of air is still be limited by the MAF sensor.
I did get better throttle response, but my old TB was really sloppy.
It won’t make any difference. I put a 52 mm Holley on my 89. But the volume of air is still be limited by the MAF sensor.
I did get better throttle response, but my old TB was really sloppy.
Interesting. I’ve also seen a lot of praise for the holley tb and I’m leaning towards getting it, but I can’t seem to find it online anywhere! Do you happen to have the link to it? No worries if you don’t!
It won’t make any difference. I put a 52 mm Holley on my 89. But the volume of air is still be limited by the MAF sensor.
I did get better throttle response, but my old TB was really sloppy.
Mine I think is shot at this point. I have a bolt missing from the tps sensor. I think my only option is to go to a 52mm TB but I'm not worried about getting any power from it I just want better throttle response. I'm only getting 9mpg and can't find any 48mm TB's in good enough shape. What do you think?
The better initial response is probably a little deceiving since all you're doing is getting more air in proportion to throttle opening vs the 48. But after a certain point probably no difference.
It won’t make any difference. I put a 52 mm Holley on my 89. But the volume of air is still be limited by the MAF sensor.
I did get better throttle response, but my old TB was really sloppy.
The MAF has no effect on the amount of air flowing through the intake. It only measures it. Then the computer needs to send the appropriate pulse to the injectors in order to achieve the best fuel/air ratio. Step by step, here's what I would do. Starting at the front, remove air cleaner and toss it to the side. Order a plastic replacement that has the hole on the lid opened up. After all, you're trying to get more air. Add a K&N washable performance filter. While that is off, clean or replace your MAF and set the snorkel to the side. Make sure your snorkel is smooth, not ribbed. If it has the air foil/diffuser on the throttle body remove and set aside. For 1988 and above, remove the frisbee from the water pump and toss it. It's about 20lbs of useless weight and you will instead send that HP to the rear wheels. Remove the smog pump with a delete kit and pulley that uses the stock serpentine belt. Again, it's not needed and sends about 12 hp to the rear wheels. Remove throttle body and remove and clean TPS and Idle control sensors. Clean well, including electrical connectors. Inspect your connectors, you might need to replace if they don't sit snuggly in their sensor plug. (Drink a beer) Install everything back together and adjust sensors to proper voltage. Lift the car and cut off your exhaust and replace it with almost anything that isn't stock. More air in means more exhaust needs to get out. Now disconnect your battery and remove all the fuses from your fuse block. Get a can of electrical contact cleaner and spray the heck out of the fuse block. Inspect each fuse and sand connectors as needed. Make sure they fit snuggly. Some of the cheaper fuses have blades so thin that they barely make contact. (go inside and drink a beer while you polish the bejeezus out of the air foil) Replace the air foil in the throttle body. Tighten everything and see where you're at but you probably still have a little work to do if you REALLY want to have a 52mm TB. Change the sock on your fuel pump and install a fresh, hi-po fuel filter. Now pull the air intake, fuel rails and injectors. Have the injectors professionally cleaned OR, get delphi 24# injectors and an adjustable fuel pressure regulator. You need to give your computer something to work with. You added a lot more air, now the computer needs operational flexibility with the fuel ratio. If you do all that, you will get 12ish rwhp from the 52mm TB. Plus 50-70HP from the other stuff. And please, please use good spark plugs, wires and upgrade distributor cap, coil and ignition control module. Hope that helps
Throttle Body Replacement
