88v8 Ivor Duarte Gloucestershire UK (1052 posts) Registered: 02/11/2010 04:29AM Main British Car: 1974 Land Rover Lightweight V8 |
Performer / AVS2 4bbl, tune compared.
Removing the 500 cfm Performer from my 215 Rover V8 because of ethanol crap, and replacing it with a 500 cfm AVS2.
In this thread I recorded the Performer tuning setup, and I assumed I would just be able to swap the tune into the AVS, but nooooo. The out-of-box of the Performer is 086 primaries with 65/52 rods, but the AVS has 095 jets with 70/52 rods, which is 30% richer on cruise and 35% richer on power. Presumably there's a reason for that, so I shall have to get out the AFR meter and start again. Also, I'm not sure that I can swap the accelerator jets... are they a different design... Edelbrock's website has me tearing my hair.... it's pouring with rain atm so I'll go down to the garage and check later. And the AVS has an autochoke, I never ran an autochoke, we'll see how that goes. Anyone done the Performer / AVS2 swap? Ivor Edited 1 time(s). Last edit at 08/05/2023 05:19AM by 88v8. |
MGBV8 Carl Floyd Kingsport, TN (4571 posts) Registered: 10/23/2007 11:32PM Main British Car: 1979 MGB Buick 215 |
Re: Performer / AVS2 4bbl, tune compared.
No. Been using my Carter/Edelbrock 500 for 22 years now. Often with E10. No issues.
Out of the box jetting is for an assumed larger engine. |
88v8 Ivor Duarte Gloucestershire UK (1052 posts) Registered: 02/11/2010 04:29AM Main British Car: 1974 Land Rover Lightweight V8 |
Re: Performer / AVS2 4bbl, tune compared.
I asked Tech Support why the fatter jetting, the reply was it's related to the annular booster... which makes no sense.
So yesterday I put the carb on the engine, created the wiring for the autochoke where I used a relay given it can apparently spike at 10A, and I swapped in the tune from the Performer with the exception of some fatter rods because I'm being cautious and I can easily swap in the current rods at the roadside if my AFR meter gives me the OK. Unfortunately it's raining (again) all day today so I will have to wait until tomorrow to start it up, given the car is 'garaged' outside. I presume despite the autochoke I still need to prime it with a couple of squirts? Ivor Edited 1 time(s). Last edit at 08/08/2023 04:41AM by 88v8. |
MGBV8 Carl Floyd Kingsport, TN (4571 posts) Registered: 10/23/2007 11:32PM Main British Car: 1979 MGB Buick 215 |
Re: Performer / AVS2 4bbl, tune compared.
Try it without first. Didn't want the manual choke version?
I have never had a choke on mine. I just turn on the key, listen to the Carter fuel pump for 7-8 second, pump the gas 3 times to the floor, then start the engine with my foot off the gas. |
88v8 Ivor Duarte Gloucestershire UK (1052 posts) Registered: 02/11/2010 04:29AM Main British Car: 1974 Land Rover Lightweight V8 |
Re: Performer / AVS2 4bbl, tune compared.
The manual choke on my Performer started up OK, but then I had to juggle it two minutes or more in the winter, before I can drop into Drive.
I didn't particularly want an autochoke, but on eBay up pops this 500cfm AVS2, low mileage the @#$%& said, and it happened to have an autochoke, and it was $$ below retail, so.... now I have an autochoke. Two pushes on the throttle, it started right up. Set the fast idle. I could drive it straight away, no juggling, which is nice. Out with the AFR meter to see what's what. Can I simply transfer the tune that was in the Performer....? Well, the 7057 rods I had in the Performer gave around 16/17, too lean, so the answer is No. Tried 7042, 6852, then 6755 which run at around 14/15 and 11/12 at WoT so that's fine. In my OP, I was talking nonsense about the squirters, I misunderstood the annular thing, the squirter nozzles are the same as the Performer so I transferred the 024s, rod in the bottom hole. No bog off idle, if anything it's fat. So that's it: 083/080 jets 6755 rods Orange springs perhaps 024 nozzles. I haven't adjusted the secondary air valve as there's no spike going into WoT. I just need to look at the transition springs, I see a cruise/power spike on the meter, may go back to that tomorrow. Ivor |
MGBV8 Carl Floyd Kingsport, TN (4571 posts) Registered: 10/23/2007 11:32PM Main British Car: 1979 MGB Buick 215 |
Re: Performer / AVS2 4bbl, tune compared.
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88v8 Ivor Duarte Gloucestershire UK (1052 posts) Registered: 02/11/2010 04:29AM Main British Car: 1974 Land Rover Lightweight V8 |
Re: Performer / AVS2 4bbl, tune compared.
Yes, an interesting Motortrend article there or is it an infomercial, anyway I agree the throttle response is really sharp compared to the Performer..
Not that one notices too much when driving with an auto but still.... Ivor |
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MGBV8 Carl Floyd Kingsport, TN (4571 posts) Registered: 10/23/2007 11:32PM Main British Car: 1979 MGB Buick 215 |
Re: Performer / AVS2 4bbl, tune compared.
How much vacuum at idle, Ivor? Those orange springs tend to be a bit weak for an engine with a lot of vacuum.
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