Tune done on a 99 Tacoma with Haltech 2500 Nexus n WB1

Hello everybody, i am Jerry from Morrison Colorado, I built some vintage vw custom bugs when I was a kid and now have built up a 99 Tacoma 4x4 3.4 5VZ over the years. Just replaced my TRD supercharger with a magnuson TVS 1320, 450cc injectors, lightweight crank pully, clutch fan delete, throttle body spacer, URD tensioner pulley n 58 mm charger pulley, Volant closed box cold air intake with 6x6 hole mod in fenderwell, TBA headers ( modified) ,Borla 2 1/2 " cat back exaust. I had a tuner in Denver that built a basemap from scratch then followup fine tuning that was a first for him for the 5VZ motor which he did a good job on just a couple of issues concerning cold start issues with long first crank with no start then second crank it starts. I will make another post later with all the details in the tuning section. Anyone with experience tuning on the 5VZ could be of help.

This is unlikely to be a 5VZ specific issue and is more likely just a general cold start tuning issue. The first place to start is to ensure that the VE table is correctly calibrated, particularly in the idle areas. From here it is a case of adjusting the cold start parameters to suit your engine. Generally i find the default values should be good enough to be in the ball park, however in some instances they may need further adjustment. I'd be specifically looking at the 'Cranking', 'Post Start' and 'Coolant Temp Correction' parameters. There are gold member webinars on adjusting these if you want further information. I find that a good way of addressing these parameters initially is to make a large change so it is easy to assess the affect of the change. Then you can fine tune once you know which direction you need to head in.

Yes thank you Andre, looks like we have the cranking and post start figured out, idle is fluctuating a little, drops down a little but after some high boost runs it seemed to be holding . From what I understand the transient throttle adjustments can help with that. It is showing that it was disabled along with the prime pulse by the previous tuner. We figured this all out on our own. I've learned so much! Any more help would be appreciated. Thank you, Jerry

More pics

The cam positioning sensor was deleted too for a trigger issue because of a cutoff issue at 4,000 RPM. Why would he do that?

The cam positioning sensor was deleted too for a trigger issue because of a cutoff issue at 4,000 RPM. Why would he do that?

With so little context it's very hard to answer this sorry. This could have been a configuration issue with the ECU at a best guess. The factory trigger pattern is a 36-2 crank trigger with a single tooth on the cam and a VR sensor. Maybe the polarity on the cam sensor was incorrect.

If it's running with no cam position sensor then you wouldn't be able to run sequential injection or direct spark ignition. The stock 5VZ uses waste spark ignition so it makes no difference here, but ideally I'd always prefer sequential injection where possible.

Ok thanks, the long first cranking issue we thought was fixed because it started on first crank for two days in the morning but then third day no start. Anyway we are doing the timing belt and replacing the cam sensor then getting a new tune from the best around for 5vz here in the states

Hopefully there are no underlying issues such as wiring but feel confident that this tune will be spot on as he has done over 100. Check out Gabe at SNP Inovations he has a 1200 hp sand drag car on the internet. I will keep you posted after I get the tune. Thanks so much!