old motorhead
Member
Planning to add long tubes, 2.3" pulley, and flex fuel. What needs to be done to the fuel system to accommodate these upgrades?
CT5 BW fuel system
- Thread starter old motorhead
- Start date
blkout
Seasoned Member
Not likely to be able to run full E85 safely, but you should be able to run an E40-E50 blend. To run full E85, you're looking at one of a few options, cam swap, Wisher Aux injection, or DSX port injection.
old motorhead
Member
Well, scratch the flex fuel plan. Is the 2.3" pulley, long tubes, and a 93 octane tune worth doing?
TERRAVAST4
Seasoned Member
Those are all worth doing. Ported blower lid and a larger throttle body as well
blkout
Seasoned Member
Yea, fueling on this platform costs a bit but it's a lot cheaper than it use to be. The Wisher Aux injection just changed the game drastically for fueling. Its half the cost of a cam swap or port injection. That being said you can go to 750-780whp range on mostly stock fueling with 93 octane. Only need a DSX aux fuel pump.
old motorhead
Member
How big is the stock throttle body? On my last TVS supercharged LS3, the stock 90mm throttle body was a significant restriction at 660 rwhp. I measured 4" of vacuum between the throttle body and the blower at WOT at 6500 rpm. It wasn't the CAI either as I measured vacuum between the throttle body and air filter. There was none there.
Need to put more miles on her before I kiss the warranty goodbye. Just over 500 miles today. I have a little time to come up with a plan. May just bite the bullet and go with a bigger blower from the start. From what I've read, the stock blower tends to run really hot once you spin it up past stock blower speeds.
The intake air temps on my Heartbeat TVS2300 running at 9.5psi would go up only about 40 degrees during a sprint. Recovery was quick too. What are the intake air temps like on a stock LT4?
Need to put more miles on her before I kiss the warranty goodbye. Just over 500 miles today. I have a little time to come up with a plan. May just bite the bullet and go with a bigger blower from the start. From what I've read, the stock blower tends to run really hot once you spin it up past stock blower speeds.
The intake air temps on my Heartbeat TVS2300 running at 9.5psi would go up only about 40 degrees during a sprint. Recovery was quick too. What are the intake air temps like on a stock LT4?
blkout
Seasoned Member
Stock LT4 throttle body is 87mm. You can upgrade to a 95mm which comes stock on the LT5 engine in the 2019 Corvette ZR1 but most people skip that and go to an aftermarket 103mm throttle body when the blower is ported. Air temps will get hot on the LT4 if you swap pullies and spin it faster. There are some additional cooling mods that can be done to help though. I chose to go with a Magnuson 2650 on mine instead of porting the stock blower and spinning it to the moon
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TERRAVAST4
Seasoned Member
Are you also on performancetrucks.net?
old motorhead
Member
I used to spend a little time on performancetrucks.net. Haven't been there in years though.
TERRAVAST4
Seasoned Member
I remember the name. We both went to the dark side
Carguyshu
Seasoned Member
FYI is you go with a maggie 2650 and keep the stock tune, they'll provide a 3 year / 36k mile warranty on the entire driveline (though there is a dollar cap on the warranty). The maggie would spin slower to achieve the same boost and run a lot cooler compared to a pulleyed OEM lt4 blower. It is a lot more expensive than a pulley, though, so it depends on how much that extra 3yr/36k warranty is worth to you as well as if you're doing track work where extra heat is an enemy over a full session
old motorhead
Member
The way I read it, it appears that the added powertrain warranty is an extra cost item. I wonder what it would cost.
TERRAVAST4
Seasoned Member
The warranty is through magnuson.
Carguyshu
Seasoned Member
The powertrain warranty is only for certain models and blackwing is one of them was what my understanding was
old motorhead
Member
The ad I read said this: "Standard 3-year/36,000-mile limited Supercharger System Warranty, with an additional Powertrain warranty available."
That does not sound like it's free to me. Hope I'm wrong. I'll call tomorrow and find out.
That does not sound like it's free to me. Hope I'm wrong. I'll call tomorrow and find out.
Carguyshu
Seasoned Member
Yea when you read the warranty booklet it specifies that you have to have an ASE certified mechanic install it and do under a certain mileage. There is also a limitation on how much in total the warranty will cover in dollar terms. I don’t remember how I found it but I distinctly remember those details
Carguyshu
Seasoned Member
Here’s the warranty info https://cdn.shopify.com/s/files/1/0..._LIMITED_POWERTRAIN_WARRANTY.pdf?v=1737583607
blkout
Seasoned Member
To be honest though, the stock tune isn't ideal with a 2650. It will pull timing and won't make nearly as much power as it would if it were tuned. These cars can compensate for some minor mods like headers and some intakes but once you start porting the blower, using pullies to increase boost, it's not ideal at all. You are correct though that it will run a LOT cooler than the stock ported blower with pullies.
old motorhead
Member
Paying a shop to install the blower isn't something I'm ready to do. I have a fully equipped shop and the ability to do jobs like this. I've done them before. My son is a better mechanic than me. He's MUCH better at leaning into an engine bay. My back barks pretty loudly if I do it for any length of time. It's hell to get old!
Appreciate the clarification on the warranty.
Appreciate the clarification on the warranty.
old motorhead
Member
How much more boost did you get going with the 2650?
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