Upgraded Turbo recommendations?

[Jc951]

I'm no expert, but i've talked with Charlie from Evergreen a couple times. Told him my goals (somewhere around 325hp) and he suggested that I use the Raptor K26/6. I currently have a motor and turbo from an 89' swapped into my 86' by previous owners. It runs good and is quick, but just lacks in that typical turbo lag. Charlie said that the k26/6 Raptor should get me to my goal power at around 15psi that I was planning on maxing out at.

He said full boost should be up around 2500 and not really drop off till about 5800 or somewhere around there. For what I do with mostly backroads/city driving and hoping to do some AutoX or a small track day here or there, that turbo should be plenty enough. Only time will tell.

[SirLapsalot]

Interesting. Have an appointment to have them relocate the sensor now. I've noticed that the car runs pretty lean at idle and at low loads. In the 16s at idle most times. Could this be related to the sensor placement?

Car runs in the mid-high 11s at WOT, so I'm not terribly worried that its too lean when it matters most... unless of course the sensor cant be trusted at all because of its placement.

It looks like the Innovate uses a Bosch LSU 4.9 sensor. Strangely Bosch seems to have reduced the amount of info in their data sheets. They used to include a plot of pump current as a function of absolute pressure. This showed that at higher pressure the pump current would change by up to ~25% around what would be EBRs equivalent to like 1.5 (common in tuned 951) iirc. The relationship was not linear and at lower pressures like you’d see at idle the effect was none/minimal (so your concern about idle is probably unrelated).

The only problem with that plot (and maybe why they removed it) is that it showed pump current instead of actual lambda. I think the relationship between those is also not linear so it may have led to confusion. Anyway, the point is that WB lambda sensors will not read accurately with backpressure unless the lambda controller has back pressure compensation capability and is calibrated according to the lambda sensors manufacture specs. Any decent standalone ECU with an onboard lambda controller would have this compensation and/or something like a Motec LTC/Link CAN-Lambda will have that functionality so in those cases you could use the crossover location if you really wanted to. However it looks like the generic WB gauges from Innovate/AEM etc do not offer that.

I’m on my phone and too lazy to search and post links but if you google search you should be able to find those old data sheets and/or find better explanation.

[blade7]

Bless your heart.

[944m3]

Charlie was incredibly easy to work with. I'd recommend him to anyone.

I finally got the turbo and electronic boost controller on the car. What a difference! I was pinning the dash boost gauge before at 2 bar and it didn't feel like this before. It feels very fast at the 11-12psi I have it set to right now.

If anyone is in the market for an electronic 3 port solenoid boost controller, the Innovate SCG-1 has been great so far. We put the wideband into the factory narrowband bung, and were able to give the factory dme the narrowband voltage via some programming on the SCG-1. It was incredibly easy to dial in, and the AFR safety cuts are a big comfort.

Planning on turning the boost up some more over the weekend, but the powerband is very fun at the mild 11-12psi.

@TurboD could you describe your boost controller setup? Top or bottom port for the solenoid?

What spring size are folks using for their dual wastegate?

I’m using an electronic boost controller with my MaxxECU and a Tial 38mm with .8 bar spring. it feels much better than before but I suspect it can get better. I’ve played around with different configurations, solenoid on the top port switched to bottom. Curious to hear what others are doing.

[Jinman3]

Hmm, Vitesse sounds like a cool option in terms of turbo upgrades but their website says they are out of stock (not that I'm currently in the market yet). I have heard from a different community to stay away from LR kits for power as their stuff is made cheaply. For today's options, where should I look?

I would like to achieve 400hp on my car as it won't be TOO difficult for a build but it's hard to find other options that aren't LR.

[Tom]

Hmm, Vitesse sounds like a cool option in terms of turbo upgrades but their website says they are out of stock (not that I'm currently in the market yet). I have heard from a different community to stay away from LR kits for power as their stuff is made cheaply. For today's options, where should I look?

I would like to achieve 400hp on my car as it won't be TOO difficult for a build but it's hard to find other options that aren't LR.

Paging @Fast951 to see if there's any shot at a Vitesse turbo these days. I've had several, and they are fantastic! If no luck there, I'd call Charlie at Evergreen and let him build what you want.

[Jinman3]

Good to know! Thanks Tom. I need to figure out why my car is suddenly dying while driving before it gets an upgraded turbo but it's good to know other builders!